Six people were killed and 22 injured Friday when a bomb loaded on a bicycle exploded in a market in the northern Afghan province of Kunduz, dpa quoted an official as saying. The target of the attack was police forces who were patrolling the main market of Khan Abad district. "One policeman and five civilians were killed in the attack," Sayed Sarwar Hussian, spokesman for police chief of Kunduz said. Three children and four women were among those injured. No group immediately took responsibility for the bombing.