Gunmen attacked a police station in the southern Afghan city of Kandahar on Wednesday, killing at least four people and wounding three others, government and hospital officials said. Kandahar provincial spokesman Zalmai Ayubi said the attack began at 8:30 am (0400 GMT) and was still ongoing more than an hour later, with a district police chief among those killed. \"The police department of Kandahar\'s 1st district came under attack an hour ago by unknown gunmen. So far the police chief of 1st district has been killed and a number of other policemen are dead or injured,\" said Ayubi. A doctor at Kandahar\'s Mirwais hospital said it had received four dead and three wounded. \"All are policemen,\" said Sardar Wali.