A blast apparently caused by explosives stored in a house in the southern Pakistani city of Karachi killed at least seven people Friday, some of whom may have been militants, AP quoted police as saying. The explosion occurred in Baldia, police Chief Wasim Ahmad said. Its exact cause was unclear. TV footage showed police seizing guns, suicide vests and grenades from the site. Federal Interior Minister Rehman Malik said some people from the Swat Valley, a region where the army has waged an offensive against the Taliban, were believed to have been staying at the house along with some guests, but he stressed the investigation was ongoing.
