CHATTANOOGA, Tenn. (AP) — A gunman unleashed a barrage of gunfire at two military facilities Thursday in Tennessee, killing at least four Marines and wounding a soldier and a police officer, officials said. The suspect also was killed.

Chattanooga Mayor Andy Berke said five people died in all, including the gunman.

U.S. Attorney Bill Killian said officials were treating the attacks as an "act of domestic terrorism," though FBI Special Agent in Charge Ed Reinhold said authorities were still investigating a motive.

Two U.S. officials, speaking on condition of anonymity to discuss an ongoing investigation, told The Associated Press four U.S. Marines were among the dead. A soldier was being treated at a hospital for a gunshot wound to the leg, according to one of the officials. The other official said a police officer also was wounded.

"Lives have been lost from some faithful people who have been serving our country, and I think I join all Tennesseans in being both sickened and saddened by this," Gov. Bill Haslam said.

A facility 7 miles away on Old Lee Highway also was attacked. Brian Lepley, a spokesman with the U.S. Army Recruiting Command in Fort Knox, Kentucky, said his recruiters there were told by law enforcement that the shooter was in a car, stopped in front of the facility, shot at the building and drove off.

The Army recruiters at the facility told Lepley they were not hurt and had evacuated; Lepley said he had no information about recruiters for the other branches at the facility.

Sgt. 1st Class Robert Dodge, 36, is the center leader for U.S. Army recruiting at the facility on Old Lee Highway. He said four Army personnel were in the office at the time. He said the Air Force, Navy, Marine Corps and National Guard all have their own offices right next to each other. Around 10:30 or 10:45 a.m., Dodge and the others heard a gunshot, "which kind of sparked our attention," he said.

"Shortly after that, just a few seconds, the shooter began shooting more rounds. We realized it was an actual shooting," he said. They then got on the ground and barricaded themselves in a safe place. Dodge estimated there were 30 to 50 shots fired.

He did not see the shooter or a vehicle.

The Army recruiting office was not damaged, but doors and glass were damaged at the neighboring Air Force, Navy and Marine offices.

Reinhold said all the dead were killed at the Navy Operational Support Center and Marine Corps Reserve Center Chattanooga. It sits between Amnicola Highway and a pathway that runs through Tennessee RiverPark, a popular park at a bend in the Tennessee River northeast of downtown Chattanooga. It's in a light industrial area that includes a Coca-Cola bottling plant and Binswanger Glass.

The two entrances to the fenced facility have unmanned gates and concrete barriers that require approaching cars to slow down to drive around them.

Marilyn Hutcheson, who works at Binswanger Glass just across the street, 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've seen dozens of emergency vehicles rush by: bomb teams, SWAT teams, and state, local and federal authorities.

The Armed Forces Career Center on Lee Highway sits in a short strip between a Cricket Wireless and an Italian restaurant with no apparent additional security.

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.

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Bridis reported from Washington. Associated Press writers Travis Loller and Kristin M. Hall in Nashville, and Rebecca Reynolds Yonker and Claire Galofaro in Louisville, Kentucky contributed to this report.