Egypt on Monday is to host a meeting of foreign ministers of Libya and its neighbors, as Islamist militias openly challenge the legitimacy of parliament after seizing Tripoli's airport.

Almost three years after a NATO-backed revolt ousted strongman Moammar Gadhafi, Libya has been roiled by fighting between ex-rebels who have formed militias.

President Abdel Fattah al-Sisi on Sunday denied reports that the Egyptian air force carried out air strikes in Libya on Islamist militiamen around the capital's airport.

Islamist militias openly challenged the legitimacy of parliament after announcing their seizure of Tripoli airport, plunging Libya's rocky political transition into a fresh crisis on Sunday.

The militias, which the elected parliament branded as "terrorists," said the house had lost its legitimacy through its alleged complicity with a deadly air strike on the airport that they blamed on Egypt and the United Arab Emirates.

Egypt on Saturday condemned the public execution in a Libyan football stadium of one of its nationals, reportedly by jihadists, and urged the international community to help restore security there.

An Islamist armed group carried out a videotaped execution of the Egyptian man in a stadium in Derna in the east, in what Amnesty said Friday highlighted Libya's descent into lawlessness.

Islamist fighters in the Fajr Libya (Libyan Dawn) coalition said on Saturday they have captured Tripoli's battered international airport after many days of clashes with nationalist militiamen.

The claim followed a setback the previous night when a mystery warplane raided Islamist positions, killing at least 10 fighters, a Fajr Libya spokesman said.

Using the cover of darkness to mask its identity, a mystery warplane launched a raid near Tripoli airport overnight, killing at least 10 Islamist, a Libyan militia spokesman said Saturday.

The new strike came five days after an initial night raid alarmed Tripoli residents and sparked questions, yet to be answered, about where the aircraft had come from.

An Islamist armed group carried out a videotaped execution of an Egyptian man in a football stadium in Libya, in what Amnesty said Friday highlighted the country's descent into lawlessness.

The video of the execution in the eastern city of Derna was posted on social media websites, including YouTube.

A Libyan coastguard official said on Friday a boat carrying 170 illegal migrants from sub-Saharan Africa was feared lost at sea off the capital Tripoli.

"We are looking for 170 African passengers on a wooden boat that has foundered off the Guarakouzi area" some 60 kilometers (35 miles) east of Tripoli, coastguard official Abdellatif Mohammed Ibrahim told Agence France-Presse.

Tunisian fishermen rescued 75 migrants on Thursday who had been drifting at sea for five days after leaving Libya aboard an inflatable in a bid to reach Italy, survivors told AFP.

The migrants from Bangladesh, Ghana and Nigeria had left the Libyan port of Zwara and were hoping to reach the Italian coast but were caught in a storm and got lost at sea, one of the Bangladeshis said.

Libyan authorities have decided to shut down two public television stations taken over by Islamist militias embroiled in clashes in Tripoli, a government official said Tuesday.

"The authorities have closed 'Libya al-Wataniya' which had been under the control of the provisional government and 'Libya al-Ramia' which was the voice of parliament," the official said, asking not to be named.