KABUL, Afghanistan — An Afghan official says a district chief has been killed in a roadside bomb blast in western Ghor province.

Abdul Hai Khateby, provincial governor's spokesman, said Saturday that Mirza Mohammad Ibrahim was targeted in Charsada district and was on duty at the time.

No one claimed responsibility for the attack, but Khateby blamed Taliban insurgents for the attack.

In eastern Ghazni province, Taliban fighters ambushed a police convoy, killing four police and wounding six others, said Arif Noori, spokesman for the governor.

Noori added that a police special forces commander was among the four killed in the attack early Saturday morning.

He said six insurgents were also killed and seven others wounded in the gun battle in Waghez district.

No one immediately claimed responsibility for that attack.