Update to this story.

CONCORD – The office of New York City Mayor Michael Bloomberg on Wednesday apologized for including Boston Marathon bombing suspect Tamerlan Tsarnaev among a list of shooting victims’ names that were read during a demonstration in Concord on Tuesday.

The apology came after several groups, including the New Hampshire Republican Party, blasted the Mayors Against Illegal Guns campaign for included his name.

Alex Katz, deputy communications director for the Mayors Against Illegal Guns campaign, said rally organizers relied on a list compiled by Slate.com of people killed by guns since the Dec. 14 massacre at Sandy Hook Elementary School in Newtown, Conn., “and his name was on the list.”

Tsarnaev was killed April 19 during a gunfight with police in Watertown, Mass., while trying to evade capture following the April 15 bombing.

“Tamerlan Tsarnaev was a murderous terrorist and a cold-blooded killer,” NHGOP Chairman Jennifer Horn said in a statement released about two hours before the Bloomberg Office apology. “It is outrageous that Mayor Bloomberg’s gun control group is so radical and out of touch with New Hampshire values that it believes this monster should be labeled as some kind of victim.”