People in the Sudanese capital, Khartoum, have shuttered shops and barricaded streets in response to a call for two days of civil disobedience.
The call was made after seven pro-democracy protesters were killed by security forces yesterday.
Police have once again fired tear gas at some of those setting up roadblocks.
Sudan’s University for Science and Technology said it had suspended all activities.
More than 70 people have been killed since demonstrations began after October’s coup.
After yesterday’s deaths the UN and the US embassy criticized the violent tactics of the Sudanese security forces.
The police said 50 officers were injured. End.