WASHINGTON (MCT) — American warships will prowl the waters off the Libyan coast and surveillance drones will buzz the skies overhead, but Defense Department officials said Thursday that catching the people who attacked the American consulate in Benghazi and killed the U.S. ambassador and three other Americans will involve an on-the-scene investigation led likely by Libyans.

A U.S. antiterrorism security team composed of about 50 Marines arrived in Tripoli, the Libyan capital, Wednesday and will be responsible for the safety of the embassy but would not be an active part of the investigation, officials said.