"Today was a nightmare for the city of Chattanooga," Mayor Andy Berke said. "As a city, we will respond to this with every available resource that we have."
US 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.
The first shooting happened around 10:45 am (local time); the attacks were over within a half-hour. Berke said five people died in all, including the gunman. A police officer was shot in the ankle, and others were wounded, he said.
A Marine recruiter was treated at a hospital for a gunshot wound to the leg, the Marine Corps said on its Facebook page.
"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," Governor Bill Haslam said.
The shootings began at a recruiting center in Chattanooga where five branches of the military all have adjoining offices.
A gunshot rang out around 10:30 or 10:45 a.M., said Sgt 1st Class Robert Dodge, the center leader for US Army recruiting at the center. Dodge estimated there were 30 to 50 shots fired.
Law enforcement officials told recruiters that the shooter was in a car, stopped in front of the facility, shot at the building and drove off, said Brian Lepley, a spokesman with the US Army Recruiting Command in Fort Knox, Kentucky.
Within minutes of that attack, the shooter then opened fire at the Navy Operational Support Center and Marine Corps Reserve Center Chattanooga, about 7 miles (11 kilometres) away.
"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.
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