A drone attack Sunday on an open market south of the Sudanese capital, Khartoum, killed at least 43 people, activists and medical workers said, as the military and a powerful paramilitary group battle for control of the country.

More than 55 others were injured in the attack in Khartoum’s May neighborhood, according to an activist group known as the Resistance Committees and two health care workers at the Bashair University Hospital, where the casualties were treated. Footage on social media showed bodies wrapped in white sheets in an open yard at the hospital.