Four U.S. military personnel were believed killed by the interior ministry , an official said . While U.S. authorities have filed charges in the case , no one has been arrested . The soldiers were augmenting security at the U.S. Embassy in Tripoli , the official said .
Four U.S. military personnel were believed killed by the interior ministry , an official said . The soldiers were augmenting security at the U.S. Embassy in Tripoli , the official said .