Tennessee Gov. Bill Haslam said "lives have been lost from some faithful people who are serving our country," though he did not say how many people were killed or wounded.

Chattanooga police said in a tweet Thursday afternoon that the active shooter situation was over, though there was no word on what had happened to the suspect or suspects.

Mayor Andy Berke said at a news conference that there's "an officer down" at a military reserve center. He did not release any other details. Berke called it a "very terrible situation."

The U.S. Navy said in a tweet that there was a shooting at a Navy recruiting building on Amnicola Highway in Chattanooga.

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.