KARACHI, Pakistan - Two cars exploded minutes apart Wednesday outside the American cultural center in the southern city of Karachi, wounding at least seven people, police and witnesses said. A bomb planted in the first car detonated outside the gate of the Pakistan-American Cultural Center, and one injured person was sent to the hospital, said Ghulam Mohammed Dogar, senior superintendent of city police. Minutes later, a second car parked nearby exploded, billowing fire and smoke. Wreckage from the car flew in the air and hit bystanders, and an Associated Press reporter at the scene saw three photographers and three policemen...