A Muslim militant group based here is threatening to kill Americans in retaliation for the deaths of comrades in U.S. bombings of Osama bin Laden’s terrorist training camps in Afghanistan last August. Harkat Ansar, an organization on the U.S. government’s list of terrorist groups, vowed to kill 100 Americans for every member of their group killed or wounded by the American bombing. At least seven were killed and two dozen wounded. Where or when such retaliation might occur is unclear, but the group is believed responsible for the kidnapping and killing of four Western tourists in Kashmir in 1995 and is suspected in the killings of six Americans in Karachi in 1995 and 1997. Keep a low profile, especially in Karachi.