The United States is using armed Predator drones in Libya to target Moammar Gadhafi's forces with the approval of President Barack Obama, Defense Secretary Robert Gates said on Thursday. The unmanned aircraft, already used to target militants along Pakistan's border with Afghanistan, will allow for precise attacks against Gadhafi's forces, Gates told a news conference in Washington, D.C. "He (Obama) has approved the use of armed Predators," Gates said. The first two Predators, which carry Hellfire missiles and can stay in the air for 24 hours, headed to Libya on Thursday but had to turn back due to bad weather,...