Kabul  - Twenty-one civilians and four police officers were killed Thursday in a car bombing in the central Afghan province of Logar, police said.

"Twenty-one local civilians, including school students, and four of our police officers were killed in the blast," said General Mustafa Andarabi, the provincial police chief.

The explosives, which was remotely detonated, were placed in a vehicle that had apparently been overturned purposely on a road in the village of Sheikhak in the Mohammad Agha district.

"As the local people and police were trying to remove the vehicle from the road, the explosives which were hidden inside the vehicle were detonated by a remotely controlled device, causing a massive blast," Andarabi said.

The attack, which took place about 30 kilometres south of Kabul, also injured four civilians, including three children, Andarabi said.

No group immediately took responsibility for the bombing. (dpa)