A suicide attacker on a motorbike blew himself up next to highway police guarding a road construction project in the Afghan capital Wednesday, killing one policeman and a civilian, officials said. An SUV carrying foreigners that had its window shattered in the attack may have been the intended target, said Gen. Ali Shah Paktiawal, the Kabul police director of criminal investigations. The SUV drove off and officials didn't know what group or country it was from. One policeman and one civilian were killed in the blast, said Asid Arian, a district government official. One woman and one child were injured, he was quoted as saying by the Associated Press.