A U.S. military F-15E fighter jet crashed in Afghanistan early Saturday, killing two crew members, a U.S. military spokesman said. U.S. military spokesman Col. Greg Julian said a second fighter aircraft traveling with the jet that went down saw no evidence of enemy fire. No fighter jets have crashed in Afghanistan in years. Militants are able to shoot down helicopters with rockets, but are not known to have the anti-aircraft weaponry necessary to bring down a high-flying jet. The military says the F-15E crashed in eastern Afghanistan at about 3:15 a.m. Saturday Kabul time. The military did not immediately say where in Afghanistan the jet crashed. Many areas of eastern Afghanistan, which borders Pakistan, are filled with craggy mountains. The crash will be investigated by a board of officers, the military said.