At least 80 people have been killed in a bomb blast in the Pakistani city of Peshawar. About 100 others were wounded when the explosion happened in a crowded market, sparking a fire that engulfed several buildings. The Peshawar bomb went off in the busy Peepal Mandi market street in the old city, sparking a fire that engulfed several buildings. Azam Kham, a senior government official in the city said: "It was a car bomb. The car was parked outside a market frequented mostly by women." Pakistan is on high alert amid fears of retaliatory strikes by Pakistani Taliban militants as the army attacks their strongholds in South Waziristan on the Afghan border. The blast came several hours after U.S. Secretary of State Hillary Clinton arrived in Pakistan pledging a fresh start in relations with an increasingly embattled and sceptical partner in the struggle against Islamic militancy.