A bomb exploded at a bridge on Saturday, killing at least nine security forces in a valley, AP quoted police as saying. Police officer Bashir Khan said the remote-controlled bomb hit a vehicle traveling from police headquarters in Mingora, the main town in the troubled Swat valley, as it carried money to pay the salaries of the staff in the nearby town of Kabal. Khan said the bomb was planted at a bridge between the two towns. Senior police officer Khalid Nasim said the attack killed six police and three paramilitary troops. He said four others were wounded. Initially police said two other officers were missing and feared abducted, but they were later accounted for.