Tripoli international airport came under rocket fire Wednesday for a fourth straight day, in attacks aimed at ousting anti-Islamist fighters who control the facility, a Libyan security official said.

Tripoli international airport came under rocket fire Wednesday for a fourth straight day, in attacks aimed at ousting anti-Islamist fighters who control the facility, a Libyan security official said.

"The airport was again targeted by mortar fire and rockets for several hours," the official said, asking not to be named.

An AFP photographer said the bombing sparked fires around the airport, setting ablaze a cargo plane on the tarmac and a customs warehouse, sending firefighters into action.

Extremist militias have since Sunday unleashed dozens of rockets at Tripoli airport, damaging around a dozen planes and closing down Libya's main air link with the outside world.

An airport official said Wednesday that the facility, controlled by liberal ex-rebels from Zintan, southwest of the capital, would probably remain shut for "several weeks, if not months".

The Zintan fighters, in control of the airport for the past three years, have deployed armored cars and pickups on access roads to head off any ground attack.