Floyd Lee Corkins II pleaded not guilty in August to a federal charge of transporting a firearm and ammunition across state lines and Washington D.C. charges of assault with intent to kill while armed and possession of a firearm during a violent crime.
A grand jury indictment unsealed Wednesday listed seven additional charges against the 28-year-old, including committing an act of terrorism while armed, attempted murder while armed, aggravated assault while armed, second-degree burglary while armed and three counts of possession of a firearm during a crime of violence, The Washington Post reported.
Corkins was arrested Aug. 15 in the lobby of the Family Research Council's headquarters. He allegedly wounded a security guard, Leonardo Johnson, 46, he encountered in the lobby and was then held for police by the guard and other people.
In an affidavit, the FBI said Corkins told the guard, "I don't like your politics," as he got a gun out of his backpack. He was also reportedly carrying 15 sandwiches from Chick-fil-A, a restaurant chain that became controversial when its president said in an interview he opposes gay marriage.
The council advocates for conservative positions on social issues, opposing abortion, euthanasia and same-sex marriage and describing homosexual sex as sinful.
Corkins' parents reportedly told FBI agents he "has strong opinions with respect to those he believes do not treat homosexuals in a fair manner."
Washington Mayor Vincent C. Gray Monday presented Johnson with the first-ever D.C. medal of honor for putting "his life on the line to wrestle a firearm away from an assailant and prevented what could have been a very tragic situation."