AP: US official: Tennessee Gunman Identified as 24-year-old Muhammad Youssef Abdulazeez

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A U.S. official tells the Associated Press the gunman in the shootings in Tennessee has been identified as 24-year-old Muhammad Youssef Abdulazeez. 

He was believed to have been born in Kuwait, and it was unclear whether he was a U.S. or Kuwaiti citizen. The official was speaking on condition of anonymity to discuss the ongoing, sensitive investigation. It was not immediately clear whether the gunman's first name was spelled Muhammad or Mohammad.

He is from Hixson, Tennessee, which is just a few miles across the river from Chattanooga. 

Abdulazeez is accused of killing four U.S. Marines and injuring two others, a soldier and a police officer, in a Tennessee shooting that happened Thursday morning. It is unclear at the moment how the gunman died.

CBS News reports that at a news conference, Chattanooga Mayor Andy Berke called it a "horrific" situation.

Much of the surrounding area was placed on lockdown, including Chattanooga State Community College.

Around 1:30 p.m Thursday afternoon, Chattanooga police said the active shooting that apparently took place at two military facilities was now over.

Police said in a tweet: "Active shooter situation is over. Details forthcoming."

Army recruiters at one facility told Brian Lepley, a spokesman with the U.S. Army Recruiting Command in Fort Knox, Kentucky, that they were not hurt and had evacuated; Lepley said he had no information about recruiters for the other branches at the facility.

Marilyn Hutcheson, who works at Binswanger Glass just across the street from the U.S. Naval Reserve building on Amnicola Highway, said she heard a barrage of gunfire around 11 a.m.

"I couldn't even begin to tell you how many," she said. "It was rapid fire, like pow pow pow pow pow, so quickly. The next thing I knew, there were police cars coming from every direction."

She ran inside, where she remained locked down with other employees and a customer. The gunfire continued with occasional bursts she estimated for 20 minutes.

"We're apprehensive," Hutcheson said. "Not knowing what transpired, if it was a grievance or terroristic related, we just don't know."

They saw dozens of emergency vehicles rush by: bomb teams, SWAT teams, and state, local and federal authorities.

"They're all here," she said. "You name it, it's out there."

Near the other shooting location on Lee Highway, Nicholas Donohue heard a blast of gunshots while working at Desktop Solutions. But he had music playing and wasn't quite sure what the noise had been. He turned off the music and seconds later, a second blast thundered. He took shelter in a back room.

"Even though it knew it was most likely gunfire I heard, you also don't want to believe it's happening in the moment," he said. "Since I didn't see anything, I couldn't be sure."

By the time he emerged, police were cordoning off the area.

CBS News/AP contributed to this story