A gun-control group that’s reading the names of thousands of victims of gun violence during a national bus tour apologized for including one of the Boston Marathon bombing suspects on the list.

The Mayors Against Illegal Guns stopped in Concord, N.H., on Tuesday as part of its campaign to build support for legislation to expand background checks for gun buyers. Such legislation failed in the U.S. Senate.

As part of the event, participants read the names of more than 6,000 Americans killed with guns since the December massacre at an elementary school in Newtown, Conn.

One of the names was Tamerlan Tsarnaev, who died in an exchange of gunfire with police days after the April 15 bombings.

The group says it relied on a public list compiled by Slate.com, and that Tsarnaev’s name was on the list.

“He was absolutely not a victim, his name should have been deleted before the list was provided to a family member for reading and his name should never have been read,” the group said in a statement. “It was a mistake, it should not have happened and we sincerely apologize.

(AP)