President obama is cutting short around the Dallas Police department headquarters. Police have asked that news outlets cut live needs showing officer locations. Earlier Dallas Police said the department received an anonymous threat. Coming about five 48 hours after five officers were killed in dallas. The army officer targeted the officers in revenge for the unprovoked shootings in minnesota and louisiana. We begin in dallas with manual bojorquez. Reporter f. B. I. Teams spent saturday mapping a crime scene that extends over 20 square blocks, a painstaking process thats got parts of Downtown Dallas frozen nearly 48 hours after the attack. The ambush happened thursday night when this gunman opened fire on officers after a march protesting recent Police Shootings of black men. The gunman, 25yearold micah xavier johnson, an army veteran, targeted white officers in revenge. gunfire g was killed by police during a standoff. Today at a memorial for the fallen officers, mayor mike aywlings urged his city to unite. Its all about race. Its all about race. Lets get over it. Build the bridge, and lets get over it. Theres so much hate, evilness towards each other. Its just, its just ugly. You know what . Theres a lot of people that support our cops. Theres a lot of people that erpport everybody, because in the end of the day, its all lives matter. The pain. Reporter the pain here is felt by even the youngest. Hurt right now. Reporter its also the youngest who are providing comfort. Want to give him a hug . Reporter officer ira carter knew the fallen officers. You got to start the healing and grieving process and understand which direction we rectto go and pray and hope this doesnt happen in america again. Reporter the Ongoing Investigation here is massive with streets like this one closed, possibly into next week. Reena, detectives have already interviewed more than 200 people. Reena manual bojorquez in dallas, manuel, thank you. Investigators say the gunman nicah johnson, was amassing an arsenal at his home outside of dallas. Jeff pegues has more on the sniper and his troubled past. Reporter if there was a turning point in Micah Johnsons life, it may have occurred in 2014 when his Army Commander forced him out of the military. At the time, johnson was being accused of sexual harassment. A military lawyer who represented him tells cbs news that the woman involved wanted johnson to seek mental help. Then in may 2015, about a month after the official end of his military career, police in richardson, texas, responding to a suspicious person call, found johnson sitting in a black tahoe. The incident was resolved without an arrest or charges. Cbs news has learned that dating back to 2014, investigators hnlieve johnson began building what amounted to an arsenal. He was stockpiling guns and gathering the elemen ild explosives. gunfire a search of his home after the deadly shootout with police found weapons, bombmaking materials and a journal which asficials say was a manifesto of cover and conceal tactics. The same kind of techniques he used on the streets of dallas. Ron hosko is a former f. B. I. Assistant director. Was that guy trained to kill . Absolutely. So hes shooting and moving, shooting and moving. Reporter when they finally hrnered him, Dallas Police attached c4 explosives to a robot, like this one. Police detonated the device, killing johnson. Dallas mayor Mike Rawlings says it was used as a last resort. He had a choice to come out, and we would not harm him or stay in and we would. He picked the latter. Reporter when he was surrounded by Dallas Police and talking to negotiators, johnson idid he was acting alone. Reena, investigators say they have not found any links to domestic or foreign extremist groups. Reena thanks, jeff. And were learning more about the five officers who were killed. Four were fathers, three were veterans. Omar villafranca has their story. Reporter 48yearold lorne ahrens moved from Southern California to dallas 14 years ago to fulfill his dream of becoming a Police Officer. His wife is also a member of the Dallas Police department, ahrens father, william. The pinnacle of his life was his children. He was a big strong guy, 65, a rough and tough guy, but the same guy would have tea with his daughter. Reporter before he became a Police Officer, Patrick Zamarripa was in the navy. The 32yearold loved baseball and his twoyearold daughter. 40yearold michael krol left detroit to become a Police Officer. His family called him a gentle giant. He served in dallas for eight years. Sergeant Michael Smith was on the force for 25 years. He loved his job and his church. He leaves behind a wife of nearly 20 years and two teenage children. Brent thompson served in the marines before becoming a cop. Hes the first dallas transit officer ever killed in the line of duty. Transit officer, misty mcbride, was shot several times, but will survive. Her tenyearold daughter, hunter is grateful shes alive. I said that i love you and that im glad youre here. Reporter inside the Dallas Police association, Vice President mike mata is making space on the memorial wall. Do you have more space for four officers . You know, um, i wish we didnt, but i guess were going to have to. Reporter while the nation mourns the five fallen officers, Dallas Police are trying to heal as a department. I made a rule when i had kids that i would never leave my house without telling them i love them and kissing them. And so im just going to make sure that i keep that till the day i die. Reporter here at Dallas Police headquarters, the memorial for the fallen officers feps growing. Reena, visitors here say this is part of the communitys healing process. Reena remembering the victims. Omar villafranca, thank you. Well, in warsaw, poland, president obama addressed the dallas attack. It was a rare News Conference for the weekend. Margaret brennan has traveled with the president. This has been a tough week. Reporter president obama acknowledged americas pain in the wake of the dallas shooting, but strongly rejected claims that the countrys racial divide has deepened. So when we start suggesting that somehow theres this enormous polarization and were back to the situation in the 60s, thats just not true. Youre not seeing riots, and youre not seeing police going after people who are protesting peacefully. Reporter he compared the recent attack to the 2015 massacre of black churchgoers by a mentallyill white shooter in charleston, and said the dallas shooter was deeply troubled. Bl i think the danger, as ive said, is that we somehow suggest ehat the act of a troubled individual speaks to some larger political statement across the country. It doesnt. chanting reporter but there is racial bias in americas Justice System he said, and pointed to videos of Police Brutality in louisiana and minnesota as evidence. Those instances, and the murder of Dallas Police, mr. Obama said, should prove to gun control opponents that easy access to weapons needs to be curbed. If you care about the safety of our Police Officers, then you cant set aside the gun issue and pretend that thats irrelevant. Reporter the president is cutting short his trip here to hrope and will visit dallas early next week. Reena, hell also gather police erd activists at the white house to try to fix what he called the ruptured trust between Law Enforcement and the communities they protect. Reena margaret, thanks. Well, in response to the dallas shootings, Police Departments and major cities across the country mandating that the officers patrol in pairs on piday in valdosta, georgia, police say an asian man who called 911 to report a car breakin allegedly ambushed and then shot a white officer several times. The officer is expected to survive. Prosecutors in missouri say ecother ambush happened near st. Louis when a black man shot and critically wounded a white officer during a traffic stop. And on thursday in bristol, tennessee, Authorities Say an army veteran who was black shot at passing cars and police. One woman was killed. A Police Officer was wounded. Investigators say that the gunman said he was angry about the recent Police Shootings of black men. And in houston overnight friday, police shot and killed a gunman who was standing in the road waving a pistol. Investigators say officers opened fire when the man pointed his gun at them. Across the country this weekend, demonstrators are taking to the streets and raising their voices all against Police Brutality. Teri okita says theres been trouble in several cities. Reporter tensions between the public and police boiled over for yet another night. About 1,000 protesters clashed with police, dressed in riot gear, in downtown phoenix. Mariah daniels was in the crowd. They shouldnt have pepper sprayed anyone. They pepper sprayed children if you have to go as far as pepper spraying children, youre ehe problem reporter a similar scene played out in baton rouge where iton sterling was killed on tuesday. Cameras captured an officer tointing a weapon at protesters. Another shows a woman being tackled to the ground. In rochester, new york, as a line of police advanced, demonstrators sat in the street in a show of civil disobedience. Police made more than 70 arrests and apologized for detaining two local journalists covering the story. This is justin carter, being arrested. Reporter the largest turnout may have been in downtown atlanta where thousands marched for justice. Police created a barricade of officers and vehicles to keep the crowd off the highway. And in los angeles, the citys mayor and police chief met with some highprofile protesters apcluding rapper snoop dogg. A lot of these people back here are outraged because they dont have communication with the police, and were trying to bridge the gap and become the communication so we can run down the dialogue back to them as far as what we talked about. Reporter snoop dogg, beyonce and now serena williams, fresh off her wimbledon win, have heined lawmakers in calling for ednviolence. Reena, protesters vow to continue marching until widespread changes in police iaining are made. E. Reena teri okita following the nationwide protests. Coming up next, what one Police Department is doing to end the mistrust between officers and minority communities. Minority officers and minority communities. 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Reena weve seen the mistrust between police and minorities play out across the country this week, but camden, new jersey, has taken a major step toward fixing that. Armarco morgan has that story. How are you doing, sir . What is going on . Reporter Camden Police sergeant Raphael Thornton has been an officer for nearly 20 years. Thornton, who grew up here, now commands the neighborhood Response Teams training officers eo get out of their patrol cars and engage with members in the community. Youre going to have to fight ed scrap and earn the rmmunitys trust. Reporter in 2013, camden replaced its entire police force, once plagued by deep budget cuts and corruption. Hello, how are you doing today, sir . Reporter the new department is half minorities, with fewer desk jobs and squad cars, because they want more boots on the ground. You cant just see a criminal. You cant. You got to see a man. And you have to have respect for hch other. Reporter camdens new training emphasizes de escalation. Drop the knife sir, drop the knife. Reporter they point to this incident, which was captured on the Police Body Camera last year. Officers kept their distance and onlked to the man to drop his knife. Lieutenant kevin lutz says the ifficers eventually used non lethal force, which is all a part of their training. The officers were able to communicate, provide distance, time and cover. Reporter lieutenant lutz teys handcuffs and service utapons are tools of last resort. They say that the new training is paying off. Over a period of three years, homicides are down 52 . Not everybody is going to be able to be deescalated, but i think through this training, if were able to have them thinking morally, have them acting ethically, then more often than not, those Deadly Force Encounters can be avoided. Reporter reena, just four years ago, camden was one of americas most dangerous cities. Last year, president obama praised the department for its efforts to build better relationships with its community. Reena demarco, thanks for that report. Well, still ahead, new officers join the force, at an extremely difficult time for police. An extremely an extremely difficult time for police. To i thought i had it covered. Then i realized managing was all i was doing. When i finally told my doctor, he said humira was for people like me who have tried other medications,. But still experience the symptoms of moderate to severe crohns disease. In clinical studies, the majority of patients on humira saw significant symptom relief. And many achieved remission. Humira can lower your ability to fight infections. Including tuberculosis. Serious, sometimes fatal infections and cancers,. Including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions,. And new or worsening heart failure. Before treatment, get tested for tb. 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Reena friday was Graduation Day for new Police Officers in los angeles. Dozens are joining the thin blue line at a trying time for aw enforcement. Here is mireya villarreal. cheers and applause bagpipes playing p. Reporter the stage was set esr a celebration. Today was supposed to be a happy day, but we come here hday with tears in our eyes. Reporter but weighing heavily on the minds and in the hearts in attendance were the images from dallas. Los angeles mayor Eric Garcetti you didnt become Police Officers out of fear. You became Police Officers out of hope. You didnt become police ffficers because you were scared. You became Police Officers because you love. Reporter trina nunnleys daughter, felicia, was one of 40 new cadets to join the l. A. P. D. Youve seen baton rouge and minnesota. Now youve seen what happened in texas. Police departments are under eire. R es that worry you having a daughter on the department now . Yes, of course, it worries me. And they target the policemen, but on the other hand, im there with her, so if something happened to her, it happens to me, too. You joined a profession today that is at a very difficult crossroads. Reporter chief charley beck personally welcomed each new officer. Have empathy. Try to look into peoples hearts and you must always, always do the right thing. Reporter nick wilts graduated at the top of his class. O i see also the black band that youre wearing today. Carry those men with you as youre out on patrol . Yes, maam, definitely. Were all grieving and jos heartbreaking. Reporter but carrying the grief, he says, will always be part of the job. If, you know, something agagic happens, you dont get a moment to pause. You have to get back out there and serve the community. And thats what were doing. Reena next to come on the cbs weekend news, Steve Hartman with the one word that cbuld help the nation heal, following a week of deadly violence. Eal following a week of deadly violence. 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New ensure enlive. Always be you. Jen stops working, but her aleve doesnt. Hey mom because aleve can last 4 hours longer than tylenol 8 hour. What will you do with your aleve hours . Reena well, finally tonight, no one seems to have an answer to the violence weve seen this eek, but Steve Hartman has some thoughts about it. Steve on a day like this, its always hard to find words. Thats why we turn to tears. Thats why we bow our heads. Thats why we stare blankly at our tv screens whenever they fill with the kind of horror weve seen across america this e se. I told him not to reach for it i told him to get his hand off it steve i may be a writer, but ive got nothing for you today, not to make it better. But i do have one word that i think could help deescalate this crisis. chanting its a word that has been noticeably absent from most of the protests. chanting you dont see it on signs or facebook memes, because its not meword that incites people. The missing word is some. As in some police are bad. Or conversely some Police Shootings are justified. And it doesnt have to be some any little modifier that takes the blanket out of the statement could make a big difference in tone. I was struck yesterday by an interview with michael mcclanahan, president of the n. A. A. C. P. In baton rouge, who went out of his way to include the modifier. What were going to do today is root out the 1 of the bad Police Officers that go around being the judge, the jury and the executioner of innocent people. Period. Steve what if we all followed that lead . What if, at the next march, people shouted black lives matter and good cops know it or all lives matter, but we recognize its mostly the black ones that are being lost. Just because our skin colors are black and white doesnt mean we cant speak in shades of gray. Or as the dallas mayor put it, words matter. I think that we have a tone in this country right now that our bellicose nature comes through our mouths and we need to shut them and we need to listen. Steve good advice, because when it comes to race in america, we can retreat to our corners, but at the end of the day, were still sharing the same room. Steve hartman, cbs news, new york. Reena thats the cbs weekend news for this saturday. Later on cbs, a special edition of 48 hours bringing a nation together. The broadcast begins 10 00 p. M. The news continues now on our 24hour digital network, cbsn, and at www. Cbsnews. Com. Im reena ninan in new york. Thank you for joining us. Good night. Captioning sponsored by cbs captioned by Media Access Group at wgbh access. Wgbh. Org as the nation mourns with dallas new unrest in the streets here in the bay area. Blockade at the bay bridge where protestors have brought track to a stand still again. The bizarre kidnapping case in the north bay. Police say they have a suspect. But they cant find the victim. And tonight, the feds are getting involved. Good evening, im juliette goodrich. Im brian hackney. We begin in dallas where a shattered Police Department is trying to heal after the shooting deaths five officers. Joe vazquez is live in dallas tonight. Joe it appears people are creating their own memorial there. Reporter they are, brian. Rain is starting to fall on this memorial in front of the Police Department here and that is dampening the crowds but not the spirit as folks have gathered here in large numbers to pay their respects to the fallen officers. Among the flowers and balloons and cards and prayers at Dallas Police headquarters, two strangers embrace and dissolve in tears. You all know each other . No. [ crying ] no. [ crying ] its not real. Cant hardably believe that this could happen. [ overlapping speakers ] [ crying ] reporter its going to take some healing from a lot of communities and here you are strangers and i have to point out, different race, right . Whats it going to take . Whats it take to get through . I dont know. I dont know what the answer is. But i just know that, um, people need to do more than ju