BATON ROUGE, La. (AP) — Sheriff Sid J. Gautreaux has described how the gunman killed his deputies at close range and was moving in on two other officers after wounding them when he was finally taken down.

He praises the Baton Rouge City SWAT team officer for saving more lives by firing from a long distance, through structures, at the gunman who was closing in for more kills.

Gautreaux says he's convinced that if the officer hadn't killed the gunman at the scene, "we would have had two other slain deputies and that individual would have had the opportunity to get into his car and go after other targets."

Louisiana State Police Col. Mike Edmonson says the gunman clearly targeted law enforcement, carrying two riles and a 9mm handgun in Sunday's ambush.

Edmonson showed overhead maps of the area to explain how Gavin Long snuck up behind police officers and shot them at close range.

He says another deputy had spotted the gunman's car and was about to run his license plate when the gunman shot the deputy — "that's the one critically injured, fighting for his life right now."

Edmonson says a responding SWAT team officer finally shot the gunman from about 100 yards away.

On Sunday, 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.

Federal agents in Kansas City and Baton Rouge are trying to determine where the gunman, Gavin Long, 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.

Three law enforcement officers remain hospitalized. 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.