TRIPOLI, May 9 (Xinhua) -- The UN Support Mission in Libya (UNSMIL) on Thursday condemned an attack on an ambulance in south of the Libyan capital Tripoli, where clashes have been ongoing between the UN-backed government and the east-based army.

"UNSMIL is appalled by the attack yesterday against an armoured ambulance in Qasr Bin Ghashir (southern Tripoli), seriously injuring the Director of Ambulance and Emergency Medical Services and 2 paramedics," the UNSMIL said.

"Attacks against health workers constitute a serious violation of International Humanitarian Law," the mission warned.

The east-based army, led by Khalifa Haftar, has been leading a military campaign since early April to take over Tripoli, where the UN-backed government is based.

The fighting has so far killed 443 people and displaced nearly 60,000 others, according to the World Health Organization (WHO).

Libya has been struggling to undergo a transitional period amid chaos since the fall of former leader Muammar Gaddafi in 2011.