Multiple shots have been fired at a military reserve center in Chattanooga, Tennessee.

The first calls reporting the incident on Lee Highway came in after 11 a.m., according to local media.

Chattanooga Mayor Andy Berke said at a news conference Thursday that one officer is "down" in connection with the shooting.

However, the mayor did not give more details about the officer's condition.

“Horrific incident in our community. We will release details as they are confirmed,” Berke tweeted.

Erlanger Hospital in Chattanooga confirmed to NBC News that it was treating one person injured in a shooting incident.

A manager at the Navy recruiting center told local media that a silver convertible Mustang took off after “at least 20 gunshots” were heard.

One witness told CNN that she saw a man fire multiple shots with "a high-powered rifle" at a building that houses military recruiting offices on Thursday morning.

Authorities were investigating an "active shooter incident" late Thursday morning in Chattanooga.

Tennessee Governor Bill Haslam's residence was shut down temporarily as a precautionary measure.

Police later said the shooting involved multiple victims and that the scene was no longer active.

The gunman was shot dead, authorities confirmed.