An airstrike that hit a field hospital south of the Libyan capital, Tripoli, has killed at least four doctors and a paramedic, the country’s health authorities said on Sunday.

Malek Merset, a spokesman for the health ministry of the United Nations-backed government, said the attack took place late Saturday in the Zawya District.

Forces based in the country’s east are fighting for control of the capital’s southern outskirts against militias allied with the Tripoli-based government.

The health authorities did not say which side was behind the airstrike, which also wounded at least eight health workers. But the Tripoli-based government blamed the airstrike on the self-styled Libyan National Army, led by Gen. Khalifa Hifter. The group could not immediately be reached for comment.