About a third of fallujah is secure. Charlie dagata has been covering the battle. Reporter iraqi gunners fired towards isis machine gun positions near the heart of the city. The militants retaliated with mortars as a column of iraqi humvees inched forwards as residents still trapped inside fallujah scrambled to get out. Tank commander, abdullah al shambra told us the isis tactic of hiding among civilians slowed his progress. It is hard to thread the needle with a tank. I cant kill the children. I cant kill the old womens. You know, all of them, like my father, my grandfather, my sisters. Reporter advancing soldiers face what one commander called a spiders web of home made bombs. And nests of snipers. One bullet tore through the leg of soldier hider mowein abbas who seemed more anid noyed he h to stop fighting. The soldier walked into a boobytrapped house, a bomb went off. He didnt make it. Reporter these Iraqi Special forces just finished 17 days of intense urban warfare. What was the most difficult part of it . The street by street fighting is tough he said. So we decided to fight like them and now we are beating them at their own game. As the sun begin to sink we found a group of hungry young soldiers settling down to their first meal all day. Battlehardened, weary having driven isis out of two other cities it is a brief respite as the the fight for fallujah drags on. Today, the u. S. State department pledged another 20 million in humanitarian aid skop , scott ts those who fled the city since the assault began last month. Now in urgent need of food, water and shelter. Charlie dagata back from the battlefield and in london for us tonight. Charlie, thank you. Coming up next is federal policy hindering efforts to protect children from lead . And later, a rescue at the bottom of the world. Squuuuack, lets feed him lets feto the sharks sharks yay and take all of his gold and take all of his gold ya and hide it from the crew ya. . 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We have done a good deal of reporting about lead in the water of flint, michigan. Well tonight Dean Reynolds is looking at a greater danger to children, lead paint. Used in homes for decades. We were surprised to learn that the federal government is aware of lead in homes that it rents to the poor. But it has a policy of waiting until a child is harmed before it gets the lead out. Reporter over the course of his difficult life, 6yearold mchale mcmullin had his blood tested more than 30 times. Come on. Reporter and its never been easy. It has been a routine ever since elevated levels of lead were found in mchales blood. When did he start having Health Problems . Around 16 months. What will we play, simon says . Yeah. Reporter nowadays he is a slow learner with a speech impediment and attention disorders. Tolonda mcmullin is his mother. Do you feel betrayed . Yes, i feel betrayed. I feel robbed. Reporter because almost everywhere she lived in chicago it is in subsidized housing where lead based paint is a common threat. The department of housing and urban Development Provides subsidies for them and other poor families across the country but hud regulations say a child must actually be lead poisoned before any repairs are required or moves approved. More than 2. 5 million, h. U. D. Subsidized homes have hazardous levels of lead, but h. U. D. s measurement of danger is four times higher than whats recommended by centers for disease control. H. U. D. Which declined our request for oncamera interview pro posed to bring its standard into line with the tougher cdc position but regulatory review takes a long time. Deteriorating. Reporter when he visited the mcmullins, chipping, lead based paint was easy to spot at the home threshold. A law professor at Loyola University and the mcmullins attorney. In federally assisted housing, families are forced to choose between lead poisoning and the brain damage it causes or homelessness and life on the streets. Reporter a few weeks ago, tolonda mcmullin chose homelessness. She and mchale, moved to a shelter june 3rd and are now hoping h. U. D. Can find them a safe place to life. Dean reynolds, cbs news, chicago. When we come back, a Dangerous Mission of mercy at the south pole. Tonight a Daring Rescue attempt is ongoing at the bottom of the world. A small plane flew nine hours, 1500 miles to a science station at the south pole. A sick worker there needs to be evacuated. But winter has just begun. It is 74 below zero and dark. The dejavelin twin otters, similar to this one, one of the few planes that can operate in that weather. The crew hopes to fly out tomorrow. Coming soon to your smart phone, 72 new emojis, approved by the agency that regulates such things. Among them, the rolling on the floor laughing emoji, all kind of animals, and vegetables, a dancer who looks to us a lot like john travolta, a pregnant woman, and if you have had enough, the raised hand emoji. We really like them. And well be right back. Finally tonight, investigators have closed the case of three civil rights workers who were murdered in mississippi. Correspondent bill plante covered the crime for cbs news more than half a century ago. Reporter they called it freedom summer, 1964. A drive to register blacks long denied the right to vote. At a rally, Andrew Goodman heard what would become his fate. Awe they should expect to spend it in jail, they should expect possibly somebody to get killed. Reporter then 52 years ago tonight, goodman, James Earl Chaney were murdered taken by the ku klux klan, with the help of a sheriffs deputy shot at pointblank range and buried. Their disappearance shocked the nation and captured the eye of Norman Rockwell who created this haunting image for look magazine. I was one of the swarm of reporters sent to mississippi. In chicago where i grew up racism was easier to ignore. In philadelphia, mississippi, it was up close and personal. We were outsiders, met with hostility. President johnson sent the fbi and was briefed regularly by director j. Edgar hoover. Apparently whats happened these men have been killed. Well now what would make you think they have been killed . Because of the fact that it is the same car that weer in philadelphia, mississippi. Reporter the bodies of the three men would be found together, six weeks later. The williams, chaney, goodman, and schwerner joined emmett till to Jimmy Lee Jackson whose deaths would be gated after a federal law in 2006. 41 years after the civil rights workers were killed the state of mississippi won a manslaughter conviction against one more of the klansmen. It would be the last conviction. Most of those who knew anything have died. The case that became known as Mississippi Burning is now officially closed. But there is something else. In goodmans last words to his parents, found on a postcard, all my love, words that heal. Bill plante, cbs news, washington. Thats the overnight news for this wednesday. For some of you the news continues. For others check back a little bit later for the morning news and of course, cbs this morning. From the Broadcast Center in new york city, im scott pelley. This is the cbs overnight news. Welcome to the overnight news. Im done dahler. Great britain and europe bracing for tomorrows vote that could change the face of the continent. The brit is are holding a referendum on whether or not to remain in the european union. The brexit as the it is called split families and divided the nation. Polls show older, working class voters in england generally favor leaving. Younger, belttter educated vote want to statement. It divided the political establishment, David Cameron favors remaining in the eu. Former mayor, Boris Johnston wants out. I know europe isnt perfect, believe me, i understand and i see those frustrations. I feel them myself. Thats why we negotiated and enhanced our special status. Out of the euro, keeping our borders, not involved in evercloser union, we have the best of both worlds. As you take this decision, whether to remain or leave, do think about the hopes and dreams of your children and grandchildren. They know their chances to work to travel to build a sort of open and Successful Society they want to live in rests on this outcome. I wanted, the last thing i wanted was to go against David Cameron or the government. But after a great deal of heartache, i dont think there is anything else i can do. I will be advocating, that leave, whatever the team is called, i understand there are many of them. That is, that is basically, because i want a better deal for the people of this country. Reporter last week, a british legislator was killed while campaigning to remain in the eu. Here in the u. S. , a british man is being held without bail after telling the secret service he was trying to kill donald trump. Michael Steven Sandford tried to grab an officer gun in las vegas he later told investigators he had been planning the assassination for a year. Reporter investigators say the suspect had been training at a las vegas gun range in the hours before he was arrested. Authorities say he fired 20 rounds at a target from a 9 millimeter glock pistol before putting his plot into motion a day later. I love las vegas reporter the gop presumptive nominee did not know what was really happening in the crowd at this Campaign Stop in las vegas. According to investigators, what appeared to be a disturbance was actually 20yearold michael Steven Sandfords disrupted plot to kill donald trump inside Treasure Island casinos theet ter. He was quickly rushed away. Thank you. Thank you officers. Reporter according to court documents. Sandford got up from his seat and approached an officer saying that he was seeking an autograph from trump. He then attempted to take the officers weapon. By grabbing the holster and handle with both hand. Investigators say he admitted to trying to shoot and kill trump acknowledging he would likely only be able to fire one to two rounds before being killed by police. This isnt the first threat to trump on the campaign trail. In march, a demonstrator was arrested in a rally in dayton, ohio after he tried to rush the candidate on stage. In recent months the candidates west coast Campaign Stops have on occasion included violent encounters between protesters, trump supporters, and police. Trump hasnt been the only target. Step away. Right there. Right there. Last month secret Service Agents jumped into action to protect Bernie Sanders when at least five people stormed the stage at a Campaign Stop in oakland. We dont get in tim dated easily. Reporter there is Security Camera footage of the incident in las vegas. But it is not yet been made public. According to a public defender, sandford who is a british citizen was here in the u. S. Illegally with an expired passport. He will be in court again early next month. Moon while trump has political problems as well. He fired his long Time Campaign manager. And has been having a difficult time raising money for the fall campaign. Chip reid has that. Cory lewandowski may have led donald trump to a record breaking primary victory. Monday the calls for his ouster appeared to sing in. Trump had his former top aid escorted out of trump tower. Trump said the beginning of a different kind of campaign. He is a good man. We have had great success. Reporter last night, donald trump praised controversial former Campaign Manager cory lewandowski. The decision to fire him trump said was a strategic shift. Im really proved him. He did a great job. We are going to go a little different route. From this point forward. A different style. And you are bringing in. Little different style. During his long year campaign. Trump was repeatedly forced to defend his former aide. Cory, good job, cory. Reporter even boasting about his loyalty when lewandowski was accused of grabbing and bruising a female reporter. It would be very easy for me to discard people. I dont discard people. I stay with people. Reporter lewandowski clashed with colleagues and trumps own children. Ultimately his daughter. Ivanka was a major influence. The Party Chairman said promoting veteran operative, Paul Manifort signaled a pivot to a serious general election campaign. There is no way to work a campaign with competing factions and competing understandings of what the right approach will be. Reporter one area lewandowski was seen in lacking was general election fundraising. According to new numbers filed monday. Trumps campaign and supporting committees had over 21 million on hand end of may compared with more than 100 million for team clinton. The mayor of oakland, california, insists heads will roll at the police department. The department has gone through Police Chiefs in a week. Right now, its under civilian control. Reporter we are hell bent on rooting out this disgusting culture. In no uncertain terms, oaklands mayor is vowing to get to the bottom of the sex scandal rocking the city police force. I feel this is an appropriate time to place civilian overnight over this police department. Reporter the departments high stakes game of Musical Chairs started june 9th when sean whent resigned. Ben fairow removed six days later because of still undisclosed information that led the may your to lose confidence in him. Assistant chief, Paul Figueroa took over to resign two days later. Things began to unravel in september after an officer killed himself and left a suicide note claiming several officers were having sex with a teenage prostitute. The first one at 16. The young woman at the heart of the scandal goes by the name, celeste, is cooperating with investigators. She told our station, kpix, that looking back she believes officers took advantage of her. At the time, no, i was happy to, wow, you know, these men in uniform, giving me protection. But, now that i am 1, looking back at it, yeah, i do feel, i do feel like they did. Reporter at least 14 officers are involved in the sex scandal. Two have resigned. To find out that my own Police Officers have engaged in this put some distance between you and temptation with. Meta appetite control. Clinically proven to help reduce hunger between meals. New, from metamucil, the 1 doctor recommended brand. Narrator breakfast. Dishes. Dinner. Dishes. Marriage. Dishes. Divorce. Dishes. Sleeping. snoring sputtering dishes. Not sleeping. Dishes. Life. Dishes. Death. Dishes. Existence. Dishes. Dishes, dishes, dishes. Every dish, every time. Only finish has the power ball to take on anything. Ylysol with hydrogen peroxide. Bleach. For a tough clean with zero percent bleach. Lysol that. China is apparently making good on its pledge to stop supporting hackers, targeting american companies. Fire eye, the Online Security company known for fighting sophisticated chinese hack attacks says Security Breaches linked to chinabased groups are down 90 over the past two years. The Justice Department kids chinese espionage a National Security emergency. There are more investigations and more prosecutions, but the dragnet sometimes snares the innocent. Bill whitaker reports for 60 minutes. It was so urgent, pounding so urgent that i run here to open the door without being fully dressed. Reporter last may the fbi paid an Early Morning visit to scientist xia xing xi to his home in suburban philadelphia. I open the door. I see a lot of people outside. Bulletproof yes and guns. Xi is chair of the temple physics department. Convince heed was a spy passing high tech secrets to china. He was stunned when agents burst in and handcuffed him. Reporter did you have any idea what was going on, why they were here . No, i had absolutely no idea. So the very first thing i went through my mind was this must be a mistake. Reporter xi couldnt believe this was happening to him in the u. S. He was born in china and raised during the cultural revolution. A time when families feared an unexpected knock on the door. His father, a lawyer, was taken away to a forced labor camp. As an adult, xi came to the u. S. To live and work in a free country. Why did you become an american citizen . My children were born in this country. My home is in this country. My career is in this country. So it is just feel natural that i become a citizen. Reporter xi established himself as a world leader in the study of superconductors that could help improve mris. He managed nine Government Research projects and more than 1 million in federal funding. This is your lab . Yes. One of your labs . One. Yes. Reporter the arrest had a swift impact. Temple told him to sta