The U.S. State Department is advising Americans to leave Libya "immediately."
In the new travel warning, authorities cite the "unpredictable and unstable" security situation.
They say because of security concerns the State Department has limited staffing at the Tripoli embassy. As a result, only very limited emergency services are available to U.S. citizens in Libya.
So far, the U.S. government has not called for evacuations of embassy staff. However, it was reported on Tuesday that a U.S. military amphibious warship was nearing Libya in the event evacuations are ordered.