GENEVA: Fighting has escalated in the Libyan city of Derna, with air raids, shelling of residential areas and heavy ground clashes, the UN humanitarian office said on Thursday.

There were severe water, food and medicine shortages, and electricity and water were completely cut off for the city鈥檚 125,000 residents, it said in a report that described the violence as 鈥渦nprecedented鈥� there.

The eastern city has been encircled since July 2017 by the Libyan National Army (LNA), whose commander Khalifa Haftar opposes the internationally recognized government based in the country鈥檚 west.

Located on the coast around 270 km from the border with Egypt, it is the only major town in eastern Libya outside LNA control.

鈥淭he LNA has announced that it now has control over the city鈥檚 eastern and western entrances ... and surrounding areas where clashes have been taking place,鈥� the UN report said.

Haftar鈥檚 forces are trying to wrest the city from a coalition of local fighters and Islamists known as the Derna Mujahideen Shoura Council (DMSC) or Derna Protection Forces (DPF).

Haftar says he is trying to rid Libya of the threat of militants. Critics accuse him of branding all his opponents as 鈥渢errorists鈥� as he seeks to expand his power.

The UN report said the LNA announced on Tuesday it had taken control of Derna鈥檚 highest area and the DPF subsequently announced its withdrawal from the city鈥檚 industrial zone.

鈥淟ocal sources report that DPF are currently taking positions among civilian infrastructure in residential areas, mostly in the center of the city and reportedly in civilian clothing,鈥� the UN report said, adding that civilians were being prevented from leaving the city.

Until this month, the LNA鈥檚 campaign had been largely limited to occasional airstrikes and bombardments. Since May 22, indiscriminate shelling had killed at least five civilians, including two children, the UN said.

Egypt, which backs the LNA, has also carried out airstrikes in Derna against what it said were training camps sending militants into Egypt to carry out attacks.

The LNA says its rivals in Derna are linked to Al-Qaeda. Militant group Daesh established a presence in Derna in 2014, but was pushed out by the DMSC.

The UN said no aid has entered the city since mid-March, apart from a delivery of kidney dialysis materials and medication earlier this week.