Attacks by Sudan's paramilitary Rapid Support Forces on one of the last functioning hospitals in the besieged city of Al-Fasher killed 20 people within 24 hours, medical sources said on Wednesday.
Those killed included two health workers, their colleagues at Al-Fasher Hospital told AFP on condition of anonymity.
The strikes on Tuesday and Wednesday caused "significant damage to hospital buildings" and wounded a combined 24 people.
On Tuesday, a drone strike hit the maternity ward, killing eight people.
Hospitals routinely attacked
The artillery attack on Wednesday killed 12 more.
Most hospitals in Al-Fasher have been repeatedly bombed and forced to shut, leaving nearly 80% of the city in need of medical care but unable to access it, according to the United Nations.
Across the country, hospitals have been routinely attacked, stormed by fighters and looted, with the doctors' union saying 90% of hospitals have at some point been forced shut.
Dozens of health workers have been reported killed, including in what the UN says have been targeted attacks.
More than one million flee
In Al-Fasher, exhausted medical teams are already scrambling to treat the injured from daily attacks.
Doctors, using satellite internet connections to circumvent a communications blackout, say they have taken to using bits of mosquito netting as a substitute for gauze.
Nearly 18 months into the RSF's siege, the city – home to 400,000 trapped civilians – has run out of nearly everything.
According to UN figures released on Tuesday, more than one million people have fled Al-Fasher since the war began, accounting for 10% of all internally displaced people in the country.
Al-Fasher 'on the precipice': UN
The population of the city, once the region's largest, has decreased by about 62%, the UN's migration agency said.
Civilians say the daily strikes force them to spend most of their time underground, in small makeshift bunkers families have dug into their backyards.
Satellite images show the RSF has built dozens of kilometres of walls around the city, leaving only a small exit.
"After over 500 days of unremitting siege by the RSF and incessant fighting, Al-Fasher is on the precipice of an even greater catastrophe if urgent measures are not taken (to) loosen the armed vice upon the city and to protect civilians," UN rights chief Volker Turk said last Thursday.
