The US has been watching the growing unrest in Libya and has been moving forces into there are for a the last few days including a crisis response team and just recently the USS Bataan. From Fox News:
The USS Bataan, with about 1,000 Marines aboard, has sailed into the Mediterranean Sea to assist in evacuating Americans if deadly fighting in Libya worsens, U.S. military officials said Tuesday.
Officials said the Navy amphibious assault ship sailed from the Arabian Sea and was already scheduled to go to the Mediterranean to participate in a multi-county military exercise in the region. However, they made clear the ship has received no formal orders to conduct new missions.
Also on Tuesday, the State Department called for all U.S. citizens to immediately leave Libya, saying the security situation in the country “remains unpredictable and unstable.”
via Navy ship with 1,000 Marines arrives off Libya to help Americans if unrest escalates | Fox News.
It looks like right now the Libyan PM has been attacked and another attempt at a Coup is taking place.