At least four people, including two children, were killed Wednesday in an explosion in northern Afghanistan, dpa cited an official as saying. "There was an explosion in a crowded bazaar in Dawlat Abad district at 9:30 am (0500 GMT)," said Ahmad Javid Bedar, spokesman for the governor of Faryab province. Nine civilians and a police officer were wounded in the explosion. Nobody has claimed responsibility for the attack.