A group of women demonstrated in Sudan's capital Sunday, demanding the release of sons and other people arrested during anti-government protests last month.
Witnesses say about 25 women held a protest outside the headquarters of Sudan's national security service in Khartoum. Police watched the group but made no move to arrest them.
In a different part of the capital, security forces stopped journalists from holding a protest to demand the release of arrested colleagues. Reports from the scene say police detained at least three journalists trying to cover the event.
Students have held scattered protests in Khartoum and other cities since late last month, denouncing high food prices and the government of President Omar al-Bashir.
The protests have been organized by students using the Internet, and appear to be inspired by the recent uprisings in Egypt and Tunisia.
Police and soldiers have broken up the demonstrations using batons and tear gas, while making dozens of arrests.
President Bashir has ruled Sudan since taking power in a 1989 coup. In January, security forces arrested opposition leader Hassan al-Turabi after he suggested that Sudan was ready for a Tunisia-style uprising.
Bashir won re-election last year but is wanted by the International Criminal Court on charges of crimes against humanity in Sudan's war-torn Darfur region.
Some information for this report was provided by AP and AFP.