Miasit, launched in January 2018, will "continue in order to make assistance activities in Libya more incisive and efficient", the Italian defence ministry said in a statement.

UN chief Antonio Guterres has appealed for an immediate halt to fighting in Libya after Haftar's forces claimed an airstrike on Tripoli's only functioning airport.

Thousands have fled violence in the capital city, according to the United Nations, since Haftar launched a surprise assault last week which has left dozens dead.

Italy's Bilateral Mission of Assistance and Support in Libya "supports Libyan authorities in their pacification and stabilisation activities in the country and against human trafficking, smuggling and threats to security."

No figures were provided for the current deployment but the mission has previously included around 100 troops in Tripoli and 300 in Misrata, about 200 kilometres (130 miles) to the east.

Troops from former colonial power Italy are involved in "training and technical and infrastructure assistance for Libyan security forces," in Tripoli, the statement said.

In Misrata, the troops provide security and assistance to a hospital within a military academy for the UN-backed Government of National Accord.

The oil-rich northern African country has been rocked by violent power struggles between an array of armed groups since the NATO-backed overthrow of dictator Moamer Kadhafi in 2011.

The UN-backed Government of National Accord (GNA) controls the capital, but its authority is not recognised by a parallel administration in the east of the country, backed by Haftar.