Kabul  - At least two police officers and five civilians were wounded in two separate suicide attacks in southern and south-eastern Afghanistan, official said on Wednesday.

Police fired on a suicide bomber who was driving a vehicle filled with explosives toward a military base with US and Afghan troops in Gurbaz district of south-eastern Khost province, said Mohammad Ayoub, provincial police chief.

He said three Afghan civilians were injured in the explosion Wednesday morning.

In another attack, a man riding a motorbike packed with explosives detonated himself near a police vehicle in Lashkargah city, in southern Helmand province, provincial police chief Mohammad Hussain Andewal said.

The blast killed the bomber and wounded two policemen and two civilians, he said.

No group claimed responsibility for the Wednesday's bombings. Taliban militants, whose regime was toppled in a US military invasion in late 2001, rely heavily on use of suicide attacks. (dpa)