A US drone attack has killed at least two people in eastern Afghanistan. The airstrike took place in Nangarhar province. Afghan officials say a senior cleric is among the victims. Three civilians were also injured in the attack. The US has widely used its unmanned aerial vehicles for bombing targets in other countries, including Pakistan and Yemen. Some airstrikes have targeted militants. However, many of the victims have turned out to be civilians. The United Nations has condemned the US use of drones for targeted killings.