Two bomb blasts on Friday killed four Afghan civilians, one of whom worked for the US military as an interpreter, in the latest attacks in an insurgency led by Taliban militants, authorities said. The first explosion was in the turbulent southern province of Helmand, where a remote-controlled roadside bomb struck a vehicle and killed three civilians, the interior ministry said in a statement. Two more were wounded, it said, without giving details of the casualties. The bomb was planted by the "country's enemies," it said in a reference to the Taliban who are particularly active in Helmand.