TRIPOLI, Libya (AP) — The head of a U.N.-brokered Libyan unity government has arrived in the capital by sea with six deputies and set up a temporary seat of power in a naval base despite threats from rival factions.

Militia commander Abdel-Rahman al-Swehli says the head of the government, Fayez Serraj, sailed in from neighboring Tunisia on Wednesday. A post on the unity government's website confirmed the arrival.

The officials were prevented from flying into Tripoli by a rival government based in the capital. A third government is based in the east of the vast oil-rich country. Libya has been dominated by an array of militias since the 2011 uprising that toppled Moammar Gadhafi.

Ali Abu Zakouk, the foreign minister of the rival government, says his presence is "unacceptable.