Four Marines were killed in a shooting incident in Chattanooga. CNN's Barbara Starr reports.

Authorities were investigating an "active shooter incident" Thursday at the Naval Reserve Center in Chattanooga, Tennessee, Fire Chief Randy Jackson said. The U.S. Navy tweeted Thursday that there has been a shooting at a Navy reserve center on Amnicola Highway in Chattanooga, Tennessee. An eyewitness has new information on the shooting incident at a Navy reserve center in Chattanooga, Tennessee.