Four civilians were killed and another injured as a roadside bomb struck a car in Ghazni city the capital of Ghazni province 125 km south of capital city Kabul on Tuesday night, deputy to provincial governor said Wednesday.

"The deadly blast happened in Ghazni city last night as a result two women and two children were killed and a man sustained injuries. All the victims belong to same family," Mohammad Ali Ahmadi told Xinhua.

He also blamed Taliban militants for organizing the blast. However, the outfit has yet to comment.