We begin this morning with a look at todays eye opener. Your world in 90 seconds. We are heart broken. There are no words to describe the atrocity that occurred to our city. Its a sniper . Dallas mourns after the ambush. We got a guy with a long rifle and dont know where the hell he is at. Police identify the gunman as Micah Xavier Johnson. A lonist and army reservist. They think the Police Shooting this past week were the triggers, if you will, that prompted him to act. Demonstrators taking to the streets again in several cities. Trouble in phoenix. Pepper sprayed children. You have to go as far as doing that, youre the problem. The two murders must be addressed by the Law Enforcement in congress. If we fail to act, this will be a long, hot summer. We must stand in solidarity with Law Enforcement which we must remember is the force between civilization and total chaos. We have got to start treating each other with respect and dignity. All that. President obama will cut short his european trip to return home sunday and he will also travel to dallas early next week. And all that matters. Texas rangers would like to take a moment to pause and remember those who have lost their lives in tragic events across our nation in the last week. On cbs this morning saturday. As protests continue against the violence that has sent america into mourning, the father of a fallen hero makes a plea for peace. It doesnt matter whether youre black, white, green, purple. We need to all get along. This has to stop. My son paid the ultimate price to take care of people. Good morning. Im anthony mason. Im vinita nair. President obama is cutting short his overseas visit with nato and european leaders to visit dallas early next week in the wake of the deadliest day for Law Enforcement since 9 11. Five officers were killed by a sniper during a protest on thursday he. Nine others were wounded. The gunman targeted them following the deadly shootings of two black men at the hand of Police Officers this week. Protests against those killings continued across the country friday. Last night in phoenix, police in riot gear used pepper spray against protesters. Some of whom threw rocks at police. Three people were arrested. Six were injured. However, most of countrys protests were peaceful. This morning, we are learning more about the gunman. Investigators say Micah Johnson was massing an arsenal at his home outside of dallas. Johnson was an afghan war veteran. His tour of duty ended in 2014 when he was sent back to the United States after a female soldier accused him of sexual harassment. Manuel bojorquez is in dallas with the latest. Good morning. Reporter good morning. With the gunman dead and believed to be the only person involved in the attack, the dallas mayor has now said he believes the city is safe and can move on to healing. But given the horror that played out on these streets, that could take a long time. This cell phone video shows the gunman targeting an officer. A gun fight ensues. The officer goes down. The attack unfolded in Downtown Dallas thursday night just as a march in solidarity with victims of Police Shootings, attended by 800 people was wrapping up. The shooter kept firing. Even as officers rushed to help the injured. Protesters ran for cover and provided almost instant live feed of the ambush on social media. One of them was freelance photographer michael bautista. I was literally maybe 20 yard away, 30 yards away. Close enough to see an officer go down . Yes. Close enough to see the ricochetses of bullets hitting off glass and metal. Reporter cbs news has learned that after the initial shootingsing, the gunman ran into a nearby college where he reportedly shot through windows and doors was eventually cornered by police on the second floor of a campus building. Officers tried to negotiate with 25yearold Micah Xavier Johnson, an army veteran. Police say it was then that he made his motive clear. The suspect said he was upset about black lives matter. Ed he was upset about the recent Police Shootings, he wanted to kill white people, especially white officers. The police chief said the negotiation eventually broke down. We saw no other option but to use our bomb robot and place a device on the on its extension for it to detonate where the suspect was. Other options would have exposed our officers to grave danger. Reporter the mayor said there were others the night of the protests who were carrying rifles and wearing protective gear, but it turn out not to be involved in the shooting. He also said parts of Downtown Dallas could remain closed at least through the weekend. Manuel bojorquez in dallas this morning, thank you. Also this morning, we are finding out more about the gunmans planning and what police found in his home. Jeff pegues is in our Washington Bureau with that part of the story. Reporter good morning. Law enforcement sources believe Micah Johnson had been planning the attack on police for sometime. But that it was the Police Shootings of black men in baton rouge, louisiana, and minnesota, that pushed him over the edge. Despite niche reports of three gunmen, investigators believe johnson was the lone shooter who had set his sights on police. An arsenal was found in the gunmans hole. Dallas police say they uncovered bomb making materials and a personal journal of combat tactics. Dallas mayor mike rawlings. This was a mobile shooter that had written manifest tos t shoot and move, shoot and move and he did that. He did his damage, but we did damage to him as well. Reporter skills he may have picked up during a sixyear military career. In september of 2013, he was activated to serve in 42th engineer brigade in afghanistan and he went through basic training where he would have had to qualify on m16 or m4 which are basic rifles carried by soldiers. In the army reserve, he received several award, including an Army Achievement melgdal and another medal. The 25yearold from mesquite, texas, was also active on facebook. On a page of the black Panther Party of mississippi, posted a graphic video of dolphins being slaughtered and what he wrote suggested a hatred for whites. Why do so many whites, not all, enjoy killing and participating in the death of innocent beings . Plus called him a loner who did not have a criminal record. An army soldier who served for him described johnson as quirky and funny and child at heart who never seemed to have hate toward anything. Thank you, jeff. For more on the dallas shootings we are joined by mary ellen otoole, a fbi senior pro filer and one of the foremost experts on mass shootings. Good morning. Good morning. You heard what was in jeffs report. The suspect apparently planned this for sometime and kept a personal journal of combat tactics. What do you make of what little we know of him so far . Well, its important to note that this kind of a crime, as evidenced by his behavior at the scene, was really based on a lot of planning. And it actually began in the brain. He probably has thought about this for years. And he fantasized about it and it moves into the developmental stages where he acquires the weapons and the ammunition and the other items that needs to carry it out. And then he is so wellplanned, this is so interesting to me that he is able to put it together pretty much at the last minute. He could not have forecasted that the march would have occurred when it did. So thats how wellprepared that he was. And then a cold blooded callus way he carried is out is a product of his personality and i think is very significant in this case. You mentioned his personality. Its interesting to hear Police Detail the hostage negotiations and just how hostile they were. What do you make of that particular detail . Here is what i make of that. As a trained hostage negotiator, what you look for is the ability to relate to the person youre talking to and observe times, the way you do that is to relate to their emotions. To relate to their empathy or feelings of guilt what is going on. In this case, that was not possible and what is very unusual is that these negotiators had to finally make the determination that this negotiation wasnt going to go any further, that they were not going to be able to persuade him to put down his weapons and that is gutwrenching for the negotiators, but the person that does this kind of reluctance or failure to negotiate is, oftentimes, a person that manifests trace of psychotherapy. That is a person that have no feelings and have no empathy and dont feel bad for what they have done. At the same time, they are very cold callus individuals. That is the person that this behavior seems to suggest. So its not really confusing to me that dallas had to make the decision that they did. Were you surprised, mary ellen, that they found bomb making materials in his home . Im really not. Im really not. Here is what i think about that as well. The fact that he had those materials suggestses to me that he was doing more than just reading about them, that he was in the he was at the place he was possibly going to put them together and practice with them and had this event happened perhaps two weeks from now or a month from now, he would have brought very likely those explosive devices with him. So i think he did not have the time to really put them together or practice with them and that may have been the only reason that he didnt have them, which, of course, would have made this already tragic event ten times as bad. When you think about this situation and the broader picture, does someone like this inspire other people . A lot of people are talking about whatever pushed him over the edge might have been what happened this past week. Could he be the inspiration for someone else . Well, yes, he can. And i wouldnt say that he was pushed over the edge. I mean, this was a very he did this. He was motivated. He chose to do this. Make no mistake about that. But here is what is very concerning is that in about in less than a month, we will be looking at the 50year anniversary of the texas tower shooting in which Charles Whitman went up to the texas tower and for 90 minutes, he was the same predatory person that we saw in this shooter a couple of days ago. So you have a combination of this case coming up in less than a month. What we saw a coupled ago, that is going to be a very strong motivator to someone else who is already contemplating carrying out a similar act. This wont cause someone to do it, but someone who is already doing it, it will inspire them. Mary ellen otoole, thank you for your perspective this morning. Youre very welcome. An honor guard escorted the body of one of the fallen officers to a dallas funeral home on friday. Besides their occupation, the five men shared common bonds. Four were fathers and three were veterans, all of them died in service to their community. Reporter Brent Thompson was a 43yearold grandfather who was starting a second family. He had just married a fellow dallas transit officer within the last two weeks. Lorne ahrens was married to a former cop and he leaves behind two children under the age of 11. In the tea with his daughter. Reporter michael krol knew the danger of his job but never shied away from his duty. The michigan native moved to dallas to become a Police Officer in 2007. 55yearold Michael Smith joined the force in 1989. According to the dallas morning news, he suffered a gash in his head in 2009 while lunging to protect his partner from a gang member. The army veteran was a father of two. Before becoming a Police Officer, Patrick Zamarripa spent eight years on active duty for the navy. He served three tours in iraq. His father spoke to cbs news. My son paid the ultimate price to take care of people. Good young man. He is my boy. The world lost him. He had a daughter and his wife, hell never get to see her graduate, get married, have kid, become a grand daddy. Hopefully, god willing, it will give them the strength to be able to see that. President obama is expected to return from washington tomorrow to his visit to europe. White house says the president will focus on supporting Police Officers and working to address Racial Disparities in the justice system. From warsaw on friday, mr. Obama described thursdays shootings in dallas a vicious and calculated and despicable attack on Law Enforcement. He also eluded to the nation need to have a conversation on violence and guns. When people are armed with powerful weapons, unfortunately, it makes attacks like these more deadly and more tragic. And in the days ahead, we are going to have to consider those realities as well. The president also americans to express gratitude to Police Officers nationwide every day. Presumptive nominee Hillary Clinton and donald trump condemned the dallas attack. Both said much more needs to be done to keep all americans safe. We should walk in the shoes of Police Officers who do dangerous jobs. We should walk in the shoes of africanamericans who, you know, worry about every traffic stop or every routine arrest or just going out, you know, into their neighborhood. We have got to start seeing each other with respect and dignity. A brutal attack on our police force is an attack on our country and an attack on our families. We must stand in solidarity with Law Enforcement, which we must remember is the force between civilization and total chaos. Every american has the right to live in safety and peace. Last night here in new york, hundreds of demonstrators filled Grand Central terminal chanting black lives matter. Other demonstrations across the nation. Reporter rallies on friday flooded the streets of atlanta. Thousands marched peacefully through downtown and bringing traffic to a standstill after gathering at the centennial olympic park. The police chief of pittsburgh joined this crowd in a peaceful march over that citys iconic bridges. While in the nations capital, the group black lives matter held multiple demonstrations throughout the city. Im mad about everything that is going on. Reporter the citys police chief said despite thursdays tragic events in dallas, her force will continue to do its job, as always. We go out there and we do our jobs. We watch each others back and engage with people in our community. Believe it or not they watch our back for us as well. Reporter in los angeles, demonstrators got support from celebrities like Rapper Snoop Dogg who joined this protest line outside of a cadet Graduation Ceremony and later met with the mayor eric garcetti. It was very necessary that we begin to build our laws because there has been so much miscommunication from police and the community and this is the beginning. Reporter and back in baton rouge, louisiana, where this weeks deadly events began, an angry crowd kept up the chants heard all week long. No justice. No peace. Reporter not likely to subside any time soon. We need to know reporter for cbs this morning saturday, john blackstone. As the protests spread nationwide so does the violence against police. On friday, in valdosta, georgia, police say an asian man who called 911 to report a car breakin shot a white officer who responded several times. The Police Officer is expected to survive. Prosecutors in missouri say a black man shot and critically wounded a white officer in st. Louis in a traffic stop. The man opened fire as the officer walked back to his car and giving the officer no chance to defend himself. On thursday in bristol, tennessee, a man shot at cars. A Police Officer was wounded. Investigators say the suspected gunman told him he was angry about the recent Police Shootings of black men. What does this week of deadly clashes between civilians and Law Enforcement mean for officers patrolling the streets around the country . Ed davis is a former commissioner of the Boston Police department. He in newton, massachusetts. Ed, good morning, and thanks for joining us. Thank you. Good morning. What do you think is going through the mind of so many officers across the nation today . Well, caution is the watch word today. I think that officers understand that that the situation in the country is such that they have to be deliberate and cautious in the way that they are performing their duties. And it really is a terrible to have this kind of situation develop. It really cuts into my former colleagues attempts to implement Community Policing in the neighborhood of the United States. Commissioner, after an event like this, do the Major Police Departments around the country talk to each other about how to handle Something Like this . They do. We speak all the time. The major city chiefs have a very good communication network, in addition to that, the Fusion Centers are pushing information out to each and every department across the country. So there are good systems in place and i think there are conversations about doubling up on patrols right now in many cities across the country. Its really a very difficult development. A lot of people this morning are also talking about the use of the explosive robot, questioning is this the new precedent . Is it a good or bad one . What are your thoughts about the use . Use of force is based on a continuum of force that depends on what the suspect is doing. In this particular case, the murderer of five officers and shooting of civilians, th