Suspected insurgents placed a bomb in a cart and remotely detonated it while a police vehicle drove by in Afghanistan's Kandahar province Sunday morning.
The ensuing explosion killed two civilians and a police officer, the provincial governor's office said. Eleven others were wounded.
Sunday's cart bomb was placed in front of a mosque in the Panjwai district, the governor's office said.
Sardar Mohammad Zazai, the province's police chief, said insurgents are increasingly leaving bombs in crowded areas to exact a high civilian toll.
On Saturday, a bicycle bomb exploded in front of the Red Cross office in the southern Afghan province, killing a policeman and injuring 11 people, authorities said.
Militants placed the makeshift bomb on a bicycle and detonated it by remote control at noon, Zazai said.
Elsewhere, five members of the NATO-led military force were killed in separate incidents Sunday. Three service members were killed in a vehicle accident in southern Afghanistan, one died as a result of an improvised explosive device in southern Afghanistan, and another was killed following an insurgent attack in the eastern part of the country.