Attendees of the “No More Names” event in Concord, N.H., gathered on Tuesday to hear names of gun violence victims read aloud. What they didn't expect to hear was Tamerlan Tsarnaev's name announced alongside those of their families and friends. The Boston Marathon bombing suspect died from injuries sustained in a shootout with the Boston police department and his name angered many in the crowd.

Tamerlan Tsarnaev (AP Photo/The Lowell Sun, Julia Malakie) Tamerlan Tsarnaev (AP Photo/The Lowell Sun, Julia Malakie)

Mourners protested the reading, shouting, "He's a terrorist," according to the New Hampshire Union Leader.

The event's organizer, Mayors Against Illegal Guns, has over 900 U.S. mayors as members, including New York Mayor Michael Bloomberg and Boston Mayor Tom Menino. The group was quick to apologize, saying it relied on a public list compiled by

"He was absolutely not a victim," said a statement from Mayors Against Illegal Guns. "It was a mistake, it should not have happened and we sincerely apologize."