A suicide bomber targeted a police convoy in Afghanistan's southern Helmand province on Monday, killing two people, a policeman and a civilian, AP quoted a local official as saying. The attack took place in the Helmand provincial capital of Lashkar Gah, said Omar Zwak, the spokesman for the provincial governor. He said the explosion also wounded 15 people - eight policemen and seven civilians. The police convoy was en route to the district of Sangin for an operation there, he added. In southern Uruzgan province, four Afghan policemen were shot to death overnight at a checkpoint in Shahid Asass district, said Dost Mohammad Nayuib, spokesman for the Uruzgan governor. The attackers were two other policemen from the same unit who fled the scene, said Nayuib. Another policeman was wounded in the attack, he added. "An investigation is underway to find the reason behind this attack," Nayuib said.