In this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP) MANDATORY CREDIT

Officials: 4 Marines killed in ‘act of domestic terrorism’ in Chattanooga

A gunman unleashed a barrage of gunfire at two military facilities Thursday in Tennessee, killing at least four Marines, officials said. The…