A Herndon man accused of shooting a security guard at the Family Research Council in downtown Washington has been indicted on a series of new charges, including committing an act of terrorism.

Floyd Lee Corkins II, 28, becomes the first defendant charged with committing an act of terrorism under the District of Columbia's Anti-Terrorism Act of 2002. The charge is punishable by up to 30 years in prison.

Corkins has been in custody since his arrest soon after the Aug. 15 shooting. Prosecutors say Corkins brought in a bag full of Chick-fil-A sandwiches and told the guard, Leo Johnson, that he didn't like the organization's politics before opening fire. Johnson survived the shooting and helped wrestle away the gun.

Corkins was initially charged with interstate transportation of a firearm and ammunition, along with the D.C. offenses of assault with intent to kill while armed and possession of a firearm during a crime of violence.

The new indictment by a federal grand jury in D.C. adds seven new charges, including one count each of committing an act of terrorism while armed, attempted murder while armed, aggravated assault while armed, and second-degree burglary while armed, and three counts of possession of a firearm during a crime of violence.