Released : Tuesday, February 20, 2007 7:41 AM PRISTINA, Serbia-A group claimed responsibility Tuesday for a bomb attack that damaged three U.N. vehicles, saying it was in retaliation for the deaths of two ethnic Albanian protesters killed in clashes over a U.N. proposal on the future of the disputed province. The group, which distributed a statement by e-mail, claimed to be the Kosovo Liberation Army, the now disbanded guerrilla force that fought for independence against Serb forces during the 1998-1999 conflict. It said it had regrouped in order to "avenge the death of two protesters" during a recent demonstration in...