Palestinian President Mahmoud Abbas has called off a planned trip to Libya after a militia group surrounded the headquarters of the caretaker Libyan government.
A Palestinian official said Mr Abbas, who has been in Tunisia this week, was expected to go to Libya on Tuesday but cancelled because of security concerns.
Earlier, a militia surrounded the building of the National Transitional Council in Tripoli.
The Libyan government has failed to impose its authority on the country since the overthrow of longtime ruler Muammar Gaddafi last year.
Militias control large parts of the country and the capital.