The US military has confirmed the first strike by an unmanned Predator drone aircraft in Libya. The Pentagon did not provide details of the target, but said that it occurred in the early afternoon local time. Drones can hit military targets more easily in urban areas, minimising the risk of civilian casualties. Earlier, Libya's government warned that tribes loyal to Col Muammar Gaddafi might take over the fight against the rebels in the western city of Misrata.