His trip to europe to visit dallas week. The city is mourning the deadliest day for law enforc enforcement since 9 11. A sniper killed five officers during a protest on thursday. Seven officers were wounded along with several civilians. All are expected to survive. The gunman, an army veteran, targeted the officers in revenge for the Deadly Police shootings of two black men this week. Alton sterling was killed in baton rouge, louisiana, tuesday. And Philando Castile was shot in suburban st. Paul minnesota on wednesday. 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 ] he was killed by police during a standoff. Today at a memorial for the fallen officers, mayor Mike Rawlings 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, evi 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 support 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 gotta start the healing and grieving process and understand which direction we got to 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 micah 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 tah tahoe. The incident was resolved without an arrest or charges. Cbs news has learned that dating back to 2014, investigators believe johnson began building what amounted to an arsenal. He was stockpiling guns and gathering the elements to build explosives. [ gunfire ] reporter a search of his home after the deadly shootout with police found weapons, bombmaking materials and a journal which Officials 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 cornered 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 said he was acting alone. Reena, investigators say they have not found any links to domestic or foreign extremist groups. Reena thanks, jeff. 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 2yearold 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. Brenton thompson brent serd s 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 10yearold 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 thattill the day i die. Reporter here at Dallas Police headquarters, the memorial for the fallen officers keeps growing. Reena, visitors here say this is part of the communitys healing process. Reena remembering the victims. Omar villafranca, thank you. 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 not true. Youre not seeing riots. 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. I think the danger, as ive said is that we somehow suggest that the act of a troubled individual speaks to some larger political statement across the country. It doesnt. 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 trips here to europe and will visit dallas early next week. Reena, hell also gather police and 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. In response to the dallas shootings, Police Departments and major cities across the country mandating that the officers patrol in pairs on friday 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 expectsed to survive. Is expected to survive. Prosecutors in missouri say another 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 the problem reporter a similar scene played out in baton rouge where alton sterling was killed on tuesday. Cameras captured an officer pointing 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. 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 including 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 joined lawmakers in calling for nonviolence. Reena, protesters vow to continue marching until widespread changes in Police Training are made. Reena teri okita following the nationwide protests. Coming up next, what one Police Department is doing to end the mistrust between orsses and 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. Demarco morgan has that story. How are you doing,rous . 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 to get out of their patrol cars and engage with members in the community. Youre going to have to fight and scrap and earn the communitys 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 minority 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 each other. Reporter camdens new training emphasizes deescalation. 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 talked to the man to drop his knife. Lieutenant kevin lutz says the officers eventually used nonlethal force, which is all a part of their training. The officers were able to communicate, provide distance, time and cover. Reporter lieutenant lutz says handcuffs and Service Weapons 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. Still ahead, new officers joined the force, an extremely the force, 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 Law Enforcement. Here is mireya villarreal. [ applause ] cheerp cheerp. [ bagpipes playing ] reporter the stage was set for a celebration. Today was supposed to be a happy day, but we come here today with tears in our eyes. Reporter but weighing heavily on the minds and in the hearts in attendance for 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 Officers 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 happens in texas, um, Police Departments are under fire. Does 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 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 do the right thing. Reporter nick wilts graduated at the top of his classs. 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 heartbreaking. Reporter but carrying the grief, he says, will always be part of the job. If, you know, something tragic happens, you dont get a moment to pause. You have to get back out there and serve the community. Thats what were doing. Reena next to come on the cbs weekend news, Steve Hartman with the one word that could help the nation heal following a week of deadly violence. My m. About my toothpasteice. She eveand mouthwash. 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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 week, 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 week. 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. Its a word that has been noticeably absent from most of the protests. You dont see it on signs or facebook meems memes because its not a word that insights 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 naacp 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 eastern time 9 00 central time. The news continues always on our 24hour digital network, cbs cbsn cbs news. Com. Im reena ninan in new york. Thank you for joining us tonight. Good night. Captioning sponsored by cbs captioned by Media Access Group at wgbh access. Wgbh. Org announcer the following program is sponsored by operation smile. Every year, hundreds of thousands of children are born with cleft lip and or cleft palate. Dr. Bill magee why should any child, anywhere on this planet, have to live a life of misery. Kathy majette a lot of people think that children that are born with these deformities are cursed. Just imagine a life alone, that nobody wanted to be around you. Norrie oelkers and we had children coming in for screening with brown bags over their head. Theyre never allowed to leave their house unless they have a bag on their heads. Kathy majette some children dont live, because they have problems with eating, and drinking, and die of malnutrition. Mel and they see us as their last resort. Dr. Jill gora every child deserves a fair chance at life, Peggy Stillman it may only take an hour to do something that will change their lives forever. Noreen kessler and you just see a whole new person,