The Libyan authorities on Friday suspended all flights to the eastern city of Benghazi, where the US ambassador and three other Americans were killed in an attack on the consulate, dpa reported.
An official at Benghazi airport told dpa that both international and domestic flights were suspended "temporarily." It was not clear when they were expected to resume.
Several suspects were arrested late Thursday in connection with the deaths of the four Americans, but Deputy Interior Minister Wanis Al-Sharif would not release details.
Libyan investigators were following up on evidence indicating that the attack was not spontaneous, but rather planned to take place on the anniversary of the September 11, 2001, terrorist attacks in the US.
Demonstrations were expected after Friday prayers over an anti-Islam video that has sparked violence in several countries.