A suicide attack killed two policemen in western Afghanistan, while a roadside bomb killed a policeman and injured 11 others in the south, officials said Sunday. The suicide bomber rammed his explosive-filled vehicle into a police ranger near the provincial airport in Herat province on Sunday afternoon, killing a policeman and a policewoman, said Abdul Raouf Ahmadi, spokesman for police in the western region. Four other police forces were injured in the attack that took place on a road linking the airport to the provincial capital, he said. Akramuddin Yawar, top police commander in western Afghanistan, was the target of the attack, but the commander was unharmed, Ahamdi said. Yawar was driving in the same convoy, but the bomber hit a different vehicle. Separately, a roadside bomb was detonated close to a bus carrying police forces in the southern province of Kandahar on Sunday, killing one officer and wounding 11 others, dpa quoted a statement issued by the provincial governor's office as saying. Suspected militants also killed two civilians in two separate targeted attacks in Kandahar, the capital for the province of the same name, on Saturday night, the statement said. In another incident in the northern province of Kunduz, five pro-government militiamen, including a commander, were killed by suspected insurgents, an official said Sunday. Unknown gunmen attacked a house in Emam Sahib, a district in Kunduz on Saturday night, killing a militia force commander and four of his bodyguards, district governor Mohammad Ayoub Haqyar said. The attack came a week after another pro-government militia commander was killed in a suicide attack in Kunduz city.