U.S. House Chairman says Chattanooga slayings now officially a terrorism investigation

Law enforcement perch on the rear of an armored vehicle as they prepare at a staging area on Hixson Pike to investigate the nearby home of gunman Mohammad Abdulazeez on Thursday, July 16, 2015, in Chattanooga, Tenn. Abdulazeez is the gunman in a shooting at both the Amnicola Highway Armed Forces Career Center and the Naval Operational Support Center on Amnicola Highway which left five dead, including the shooter, and a Chattanooga police officer wounded.

Today's coverage

* DesJarlais plans bill allowing qualified military personnel to carry sidearms at military installations * Who was Mohammad Youssef Abdulazeez? * Community grieves, gathers for prayers in wake of tragedy * Timeline of terror in Chattanooga shootings * Cook: On a normal Thursday morning, everything changed * Tragedy will not define us, our city will heal * Shooting shatter's city's sense of innocence

NASHVILLE -- The chairman of the U.S. House Homeland Security Committee said today the FBI has officially opened Thursday's slaying of four Marines at two military installation's in Chattanooga as a terrorism case.

Chairman Michael McCaul also said one of the weapons used by suspected gunman Mohammad Youssef Abdulazeez was an AK-47.

His comments came at a news conference at MacDill Air Force Base in Tampa, Fla.