Ships from the U.S. 6th Fleet took up positions north of Libya for four days of maneuvers near the Gulf of Sidra. The exercises will include the aircraft carriers Saratoga and Coral Sea, but the Pentagon would not say how many other ships will take part. The maneuvers are the second 6th Fleet exercises in the region in less than two weeks. Libyan jets and patrol boats have been conducting maneuvers in the region since Saturday. U.S. and Libyan relations have been tense since late December, when Washington linked the Tripoli government to terrorist attacks that month at the Rome and Vienna airports in which 20 people were killed, including five Americans.