A police chief who conducted a successful campaign against the Taliban in his district was killed by gunmen riding motorcycles, while four soldiers died in a roadside bombing in western Afghanistan, the Government said on Saturday.

Ghani Khan, police chief of the Khak-e--Safid district in Farah province, was killed on Friday evening when two Taliban militants opened fire on his vehicle, a spokesman for the Governor said.

Mr. Khan was killed instantly in the attack near his house, spokesman Abdul Rahman Zhawandai said.

“In his recent campaign against the Taliban, several insurgents were killed and arrested by police,” Mr. Zhawandai said. “He had secured the district.”

In the same province, an Afghan army vehicle was struck by a roadside bomb in Bakwa district, the Defence Ministry said without releasing further information.

Taliban militants vowed to target Afghan Government authorities and military officials as they began their annual spring offensive last month.

In April, the Taliban killed the deputy police chief of Ghazni province in eastern Afghanistan.