ISLAMABAD (AP) — A police official says gunmen in two separate attacks have shot and killed seven police officers during a polio campaign in the port city of Karachi.

Local police official Mohammad Ijaz says no polio worker was harmed in Wednesday's two attacks in Karachi, the capital of southern Sindh province.

Provincial Home Minister Suhail Anwar told the Pakistani Geo news network that the seven police officers were killed minutes apart in the city.

He says the attackers targeted police who had been deployed in the city in connection with the polio campaign, which was launched to vaccinate children. Pakistan is one of the countries in the world where polio, which can cause paralysis and death, remains endemic.