One policeman was killed and three civilians were injured in a suicide bombing on Wednesday morning in eastern Kabul, the Afghan capital, Interior Ministry spokesman Zamarai Bashari told Xinhua.

The bomber was driving a motorbike belted with explosives, Bashari said.

Some witnesses said up to six persons were injured in the explosion.

Kabul deputy police chief Alishah Paktiawal said at the scene that the suicide bomber apparently was targeting a foreign vehicle.

Eyewitness Wakil Ahmad said the bomber rushed to a foreign vehicle, probably a U.S. one, and partly damaged it. The vehicle drove away swiftly, but there were possible foreign casualties, he said.

The police have cordoned off the area, where a body was lying and shattered glass was scattering, said a Xinhua reporter.

Kabul has been struck by suicide or roadside bombings from time to time over the past few months.

A suicide car bombing killed six and injured several in the city on April 6.

Due to rising Taliban-linked insurgency, over 1,600 persons, most of them Taliban militants, have been killed in Afghanistan so far this year.