At least four army soldiers were killed and five more were wounded in a car bomb attack on their outpost in Paghman district west of the city of Kabul on Friday morning, the Defense Ministry said. 

The explosion happened in Arghandi area in Paghman district, Kabul province.  

No group has claimed responsibility for the attack.

The attack comes as violence has increased in the country despite efforts to resume peace negotiations in Doha.