Police are using tear gas to disperse thousands of demonstrators in the Sudanese capital protesting the rule of autocratic President Omar al-Bashir.
The Friday protests took place in at least eight different districts in Khartoum, including the capital's twin city of Omdurman, where supporters of opposition leader Sadeq al-Mahdi took to the streets after noon prayers.
Sudan's largest opposition groups on Thursday called for a fresh wave of protests to demand that President Omar al-Bashir step down, as the longtime ruler made another attempt at staunching popular discontent by promising wage hikes and appealing to patriotism.
In a joint statement, four groups called for nationwide protests Friday and a march on the president's Nile-side palace on Sunday.
There were also protests in the railway city of Atbara, a traditional bastion of dissent and one of several cities where anti-government demonstrations began Dec. 19, initially over rising prices and shortages but which quickly shifted to calls for al-Bashir to step down.
At least 40 people are reported to have been killed in the protests.
Al-Bashir has been in power since 1989 when he led a military coup that toppled an elected government.