A government official has admitted to 46 people being killed by paramilitaries during pro-democracy protests in the capital Khartoum.
However, doctors and hospital workers have told the BBC they believe the figure is over 100, including a child thought to be as young as six.
The violence intensified on Monday when security forces stormed a weeks-long sit-in outside military headquarters in Khartoum.
Residents said pro-government militia were all over the city. Dozens of bodies have been found in the nearby Nile River.