The British newspaper The Guardian reported that several air raids included the first alleged involvement of aircraft in the conflict, rocked Tripoli on Saturday night, in an escalation of the UAE-backed attack on the Libyan capital led by Khalifa Hafter.

The report pointed out that the UAE had established a facility to fly aircraft at the base of the air service south of Tripoli in 2016.

Experts say the old fighter jets available to Hafar's forces can not fly at night, which is likely to have been involved in the attacks.

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The report quoted director of the Sadiq Research Institute Anas Al-Qamati, that the air war in Tripoli officially entered a new dangerous stage, and became an attack by a foreign invasion force is the UAE.

"Libya is still Libya, but it is about to become Yemen on the Mediterranean," said al-Qamati, "and Hafer promised to maintain peace and stability as a myth, and attacks by UAE drones can not achieve unity."

Stephanie Williams, deputy head of the UN mission in Libya, said in an exclusive interview with Britain's Independent newspaper a few days ago that the international organization was investigating allegations that the UAE was shipping weapons to support the warlord factions of retired warlord Khalifa Hafer in violation of an international arms embargo.

The Guardian reports that last week's air raids on Tripoli reflected US President Donald Trump's approval of Hafez during a phone call, adding that the White House did not disclose the call to Friday, four days later.

Libyan sources say the change in the US position on Haftar's support came after a discussion with National Security Adviser John Bolton and contacts with Crown Prince Mohammed bin Zayed.

The Guardian notes that the United States seems to have accepted the view of its allies in the Middle East that the Hafar attack could be seen as acting as a strong leader against militant jihadist militias in Tripoli.

But many Libyan experts say Hafar is not committed to democracy, especially since he has incorporated Salafi militias into his forces.

According to the Guardian, Trump's personal support for Hoffer appeared to be an obstacle to UN efforts and British efforts to pass a Security Council resolution calling for a ceasefire.