Sudanese police on Friday fired tear gas after about 200 protesters gathered near a mosque which became a focus of Arab Spring-style protests one year ago, witnesses said.
"The people want the fall of the regime," protesters shouted, according to the witnesses who said demonstrators also denounced high food prices.
Witnesses said the protest occurred after prayers at the mosque linked to an opposition party, Umma, in Khartoum's twin city of Omdurman.
Demonstrators made the same calls in June and July last year when when scattered anti-regime protests sparked by inflation spread around the country.
They later petered out following a security clampdown.
A separate spurt of anti-government rallies occurred in December when hundreds marched in Khartoum's streets after the death of four students.
Periodic protests over the past year against the 24-year government of President Omar al-Bashir, which calls itself Islamist, have failed to generate mass following like the Arab Spring revolts against authoritarian rulers in North Africa and the Middle East which began in December 2010.
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