Forty bodies have been pulled from the River Nile in the Sudanese capital Khartoum following a violent crackdown on pro-democracy protests, opposition activists said on Wednesday.
Doctors linked to the opposition said the bodies were among 100 people believed killed since security forces attacked a protest camp on Monday.
Reports said a feared paramilitary group was attacking civilians.
Sudan’s ruling Transitional Military Council (TMC) vowed to investigate.
Residents in Khartoum told the BBC they were living in fear as members of the Rapid Support Forces (RSF) roamed the streets. The paramilitary unit – formerly known as the Janjaweed militia – gained notoriety in the Darfur conflict in western Sudan in 2003.