The Latest on the fatal shooting of three law enforcement officers in Baton Rouge, Louisiana. (all times local):

12:15

Kansas City police have arrested a man on a city warrant at the last known address for the man who killed three law enforcement officers in Louisiana.

A police statement says 39-year-old Kamerran Fryer, of Kansas City, was arrested Sunday night for a seat belt violation and released after promising to appear.

The statement said police made the arrest while assisting the FBI, and referred questions to the federal agency.

FBI spokesman Bridget Patton said agents were in the area assisting with the Baton Rouge shooting investigation, but had no further comment.

Police said it wasn't immediately known if Fryer has an attorney. He does not have a listed phone number.

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12:05 a.m.

Federal agents in Kansas City and Baton Rouge are trying to determine where the gunman got the firearms he used to kill three officers and wound three more in the Louisiana capital.

Regional spokesman John Ham of the Bureau of Alcohol, Tobacco, Firearms and Explosives says "all parts of this investigation, at least from the ATF's standpoint, are very fluid."

The slain officers were responding to a report of a man with an assault rifle and were met with gunfire. For several long minutes, it wasn't clear where the shooting was coming from.

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11:40 a.m.

Businesses around a shooting that killed three law enforcement officers in Baton Rouge, Louisiana, are reopening as police continue investigating the crime scene.

Customers were buying coffee and breakfast sandwiches Monday at a B-Quik convenience store near where officers first engaged the gunman less than 24 hours earlier.

Next door, workers were getting ready for the day at a car wash where the gunman was cornered.

Neighboring businesses were riddled with at least eight apparent gunshots. Investigators examined a hole in a window at a fitness supply business, and wood already covered another window that was shot out.

Authorities say two city police and a sheriff's deputy died in the shooting Sunday morning, and the gunman was killed by law enforcement.

11:35 a.m.

Frank Cooper works at a garage right next to the spot where the gunman killed three law enforcement officers and wounded three more before authorities killed him.

Cooper says the convenience store was an ideal target for someone wanting to catch police off-guard. It's less than a mile from police headquarters, and uniformed officers often stop there for coffee before their shifts.

The gunman was identified as Gavin Long from Kansas City. Cooper is guessing that it's unlikely someone from out of town would known about the spot.

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11:30

Three law enforcement officers remain hospitalized a day after a former Marine opened fire on them and killed three others.

East Baton Rouge Sheriff's spokeswoman Casey Rayborn Hicks says sheriff's deputy Nicholas Tullier, a 41-year-old officer with 18 years of service, was in critical condition Monday, on a respirator.

She says deputy Bruce Simmons, a 51-year-old officer with 23 years of service, was in the hospital with non-life threatening injuries and "has several surgeries ahead" for his arm and shoulder.

The third officer, with the Baton Rouge city police, was hospitalized with non-life-threatening injuries and hasn't been named by officials.

The gunman has been identified as Gavin Long of Kansas City, Missouri. State Police Col. Mike Edmonson says he was "seeking out" police officers in the shooting.

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11:20

The neighbor of one of the slain officers in Baton Rouge says that if 41-year-old Matthew Gerald had been hardened by his years in the military, you couldn't tell it when he became an officer and got his squad car.

Ashley Poe says Gerald seemed so tickled when he got his take-home car that he scrubbed it down and was playing with the lights, turning them on and off, just like a kid -- "living out the dream."

Poe said her 14-year-old son was interested in military service, and Gerald was always ready to answer his questions, telling him "how he was proud to protect his country."

Poe also says that Gerald was devoted to his wife and daughters.

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10:50 a.m.

The man who killed three law enforcement officers in Baton Rouge declared last year that he was changing his name from Gavin Eugene Long to Cosmo Setepenra.

Long described his new name in a document he filed in May 2015 with the Recorder of Deeds Office in Jackson County, Missouri. The filing also declared membership in a black separatist group that considers itself beyond the reach of state and federal laws.

County spokesoman Brenda Hill says he never followed through in court to make the name change official.

Long cited common law, saying that "an emancipated person has the right to change his or her name without legal formality."

He said he was a member of the Washitaw Nation. The Southern Poverty Law Center says this group uses pseudo-legal language and ideologies similar to that of hard-line American white supremacists.

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8:45 a.m.

In online posts, a man using an alias of the Baton Rouge shooter said protests alone don't work, and people must fight back after the deaths of black men at the hands of police.

Documents show that gunman Gavin Eugene Long sought to change his name last year to Cosmo Setepenra. A website using that name links to self-published online books on nutrition, self-awareness and empowerment. The man describes himself as a "Freedom Strategist, Mental Game Coach, Nutritionist, Author and Spiritual Advisor."

In a video posted July 10, the man says he's speaking from Dallas after the fatal attack on police officers there during a march over the deaths of black men at the hands of law enforcement. The man also discusses the protests in Baton Rouge and what he perceived as oppression.

He says: "You've got to fight back. That's the only way a bully knows to quit." In an earlier video, the man says that if anything ever happens to him, he doesn't want to be linked to any groups, and mentioned once belonging to Nation of Islam.

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8:45 a.m.

Clark Atlanta University officials say Baton Rouge gunman Gavin Eugene Long was briefly enrolled at the Atlanta university during the 2012-13 academic year.

Clark Atlanta said in a statement Monday morning that the university "categorically denounces this heinous act."

Long, a former Marine from Kansas City, Missouri, turned 29 on Sunday, the same day he opened fire, killing three law enforcement officers and wounding three others. Long was killed at the scene.

The shooting added to the tensions across the country between the black community and police.

University of Alabama spokesman Chris Bryant said Long also attended the University of Alabama for one semester, in the spring of 2012.

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8:35 a.m.

The man who killed three law enforcement officers in Baton Rouge sought to change his name last year and said he was part of a largely black group that claims to separate from state and federal governments.

Gavin Eugene Long, a black man whose last known address was in Kansas City, Missouri, carried out the attack Sunday on his 29th birthday. Police say he also wounded three officers before he was killed.

He sought to change his name to Cosmo Setepenra in a document filed in May 2015 with the Jackson County Recorder of Deeds. He also refers to himself as a member of the Washitaw de Dugdahmoundyah, also known as the Washitaw Nation.

The groups says it's a sovereign Native American nation within the boundaries of the U.S.

The name-change document ends: "Standing firm on the Ancient Principles of, LOVE, TRUTH, PEACE, FREEDOM AND JUSTICE."

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7:25 a.m.

The coroner for Baton Rouge says his office will perform autopsies Monday on the three officers slain in an attack this weekend.

East Baton Rouge Parish Coroner Beau Clark says they autopsies will begin around 8 a.m., and he expects to release his preliminary findings, including the cause of their deaths, sometime this afternoon. Clark says an autopsy on the deceased suspect is planned for Tuesday.

In the Sunday attack, a former Marine dressed in black and carrying extra ammunition shot and killed three Baton Rouge law enforcement officers, less than two weeks after a black man was fatally shot by police there in a confrontation that sparked nightly protests that reverberated nationwide.

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7:20 a.m.

Businesses around a shooting that killed three law enforcement officers in Baton Rouge, Louisiana, are reopening as police continue investigating the scene.

Customers were buying coffee and breakfast sandwiches Monday at a B-Quik convenience store near where officers first engaged the gunman less than 24 hours earlier. Next door, workers prepared for the day at a car wash where the gunman was cornered.

Businesses on two sides of the scene of a gunbattle were riddled with at least eight apparent gunshots. Investigators examined a hole in a window at a fitness supply business as news crews worked nearby, and wood covered another window that was shot out.

Authorities say two city police officers and a sheriff's deputy died in the shooting Sunday morning, and the gunman was killed by law enforcement. Three other officers were wounded. The identities of the slain officers and two of those wounded are known. But the name of the third wounded officer hasn't been released. Baton Rouge police Sgt. Don Coppola said in a text message Monday that officials plan to release that name, "just not sure exactly when."

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7 a.m.

U.S. Attorney General Loretta Lynch says she condemns the attack in Baton Rouge "in the strongest terms possible" and says federal law enforcement agencies are helping on the ground.

Lynch said Monday in Washington that "families are again mourning loved ones robbed from them by senseless violence. ... And all of us are again heartbroken at the news of yet another tragedy."

She invoked a Facebook post by slain officer Montrell Jackson. Days ago, he wrote that he received "nasty, hateful looks" while in uniform but also said, "Please don't let hate infect your heart."

In the Sunday attack, a former Marine dressed in black and carrying extra ammunition shot and killed three Baton Rouge law enforcement officers, less than two weeks after a black man was fatally shot by police there in a confrontation that sparked nightly protests that reverberated nationwide.

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6:30 a.m.

State police say the gunman in the Baton Rouge shooting ambushed the six law enforcement officers and "certainly was seeking out police."

Col. Mike Edmonson made the comments Monday morning. The shooting on Sunday killed three officers and left three others wounded, one critically. Police say the gunman was a former Marine who was killed at the scene.

Edmonson says: "His movements, his direction, his attention was on police officers."

Edmonson also says investigators have interviewed people who had contact with the gunman in Baton Rouge, but he wouldn't say how many or give other details. He stressed that officials are still asking any others who might have had contact with shooter Gavin Long to come forward.

The shooting less than a mile from police headquarters added to the tensions across the country between the black community and police.

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6:05 a.m.

Louisiana State Police have positively identified the shooter who killed three law enforcement officers in Baton Rouge as Gavin Long.

In a Monday morning Facebook post, Louisiana State Police said they needed to withhold official confirmation of his name until they had positively ID'ed him through fingerprints.

Long, who's from Kansas City, Missouri, turned 29 on Sunday, the same day he opened fire, killing three and wounding three other officers. Police said Long was killed at the scene.

The shooting less than a mile from police headquarters added to the tensions across the country between the black community and police.

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2:10 a.m.

A former Marine dressed in black and carrying extra ammunition shot and killed three Baton Rouge law enforcement officers, less than two weeks after a black man was fatally shot by police there in a confrontation that sparked nightly protests that reverberated nationwide.

Three other officers were wounded Sunday, one critically. Police said the gunman was killed at the scene.

The shooting less than a mile from police headquarters added to the tensions across the country between the black community and police. Just days earlier, one of the slain officers had posted an emotional Facebook message about the challenges of police work in the current environment.

President Barack Obama urged Americans to tamp down inflammatory words and actions.

The gunman was identified as Gavin Long of Kansas City, who turned 29 on Sunday.