WASHINGTON (MCT) — A man opened fire inside a conservative Christian lobbying group’s headquarters Wednesday, wounding a security guard, and authorities said the gunman was carrying extra ammunition and information related to Chick-fil-A — which has become a public symbol of opposition to gay marriage.

The incident began around 10:45 a.m., officials said, when the man walked into the lobby of the Family Research Council in Washington and muttered something. When a security guard confronted him, the man opened fire with a 9 mm pistol and hit the guard in the arm, a senior law enforcement official told the Los Angeles Times. Several people helped the guard wrestle the gunman to the ground and disarm him.