Baton Rouge shooting

In response to Sunday's attack, Los Angeles Police Chief Charlie Beck has released a series of measures that officers should take to protect themselves against potential copycat killers. Although no threats have been made against the LAPD, Beck announced on Monday that the measures would stay in place indefinitely.

Some of his proposed changes include increasing the number of helicopter patrols to provide ground officers with more information. In addition, the entire Metropolitan Division has been pulled from crime suppression details, in order to provide more support to officers responding to calls. Lastly, 911 calls will be vetted more thoroughly to reduce the risk of an ambush.

“Watch your back,” Beck said. “Watch each other.”

President Barack Obama has spoken to the families of the three law enforcement officers who were killed. In addition, the president has ordered that all federal buildings lower their flags to half-staff in honor of the deceased officers.

“He was in shape, clearly he was in shape” Col. Michael Edmonson, Superintendent of Louisiana state police  said about the shooter. "He was concentrated and articulate in all manners of engagement."

Edmonson said that they haven’t ruled out that it’s in retaliation to the killing of Alton Sterling two weeks ago in the same city, but haven’t seen link either.

East Baton Rouge Sheriff Sid Gautreaux gave a brief on the state of the wounded policemen.

Sgt. Bruce Simmons "gets 2nd surgery tonight, titanium rod in arm, serious condition."

Nicholas Tullier, 41, was shot in the head and stomach. He is currently in the Intensive Care Unit. “He’s in very, very critical condition,” Dabadie said. “He’s not in good shape at all.”

An unidentified 41 year old officer was also shot, but only sustained non-life threatening injuries.

"No doubt in my mind that shooter, if he'd continued in direction if city swat hadn’t arrived, he would have made sure that injured cops were killed, gotten in car and gone elsewhere to continue shooting people," Gautreaux said.

"We've been asked for the past three or four weeks about the militarized tactics and militarized law enforcement. This is why we're doing this because we’re against a force that doesn’t play by the rules. They haven't played by the rules. They didn't play by the rules in Dallas and they didn't play by the rules here. This is why - we don't ever want to use it. But we have to have the ability to use it if we need it here... Our militarized tactics, as they’re being called, saved lives here,” Baton Rouge Police Chief Carl Dabadie, Jr. said.

“Our hearts are broken but our spirit remains intact," Louisiana State Police Superintendent Col. Mike Edmonson said.

He added that the officers were intentionally targeted, we are confident the shooter was the only one involved in the attack.

"We believe the suspect was in our community for a few days," he said.

Police are looking into the motives and they are calling on everyone with some information about the suspect.

A Facebook post by Montrell Jackson, one of the slain police officers, went viral due to him relating the country's current tensions between law enforcement and minorities to his own experiences.

"These are trying times. Please don't let hate infect your heart. This city MUST and WILL get better," the 32-year-old officer wrote in a July 8 Facebook post.

Jackson, who is black, personally offered to do what he could to help heal the country's wounds: "I'm working in these streets so any protesters, officers, friends, family or whoever, if you see me and need a hug or want to say a prayer. I got you."

Gavin Long, who was killed in a shootout with police, was a former Marine from Kansas City, Missouri.

Police sources told Fox News that he may have spent days staking out the gas station where the attack that resulted in the deaths of three officers occurred. He was in Baton Rouge for six days and knew that cops often frequented the gas station and car wash where the shooting took place.

Suspected shooter Gavin Eugene Long, 29, went by the name Cosmo Setepenra online. More than a week before the Sunday killing of the three officers, he posted a YouTube video where spoke about fighting back against perceived oppression by white people.

"Zero has been successful over simply protesting. It has never worked and it never will," Long said. "You've gotta fight back, that's the only way a bully knows to quit, he doesn't understand words."

Louisiana State Police said the gunman in the Baton Rouge shooting ambushed officers and was "certainly seeking out police," AP reported.