About 1,000 people marched in the Sudanese capital calling for the government's overthrow, after a ceremony late Sunday mourning those gunned down in days of fuel price protests, witnesses said.

The rally began in Khartoum's wealthy Mansheeya neighbourhood, which was home to Salah Mudathir, 28, a pharmacologist shot dead during a protest on Friday.

"Freedom! Freedom!" they shouted, according to the witnesses.

"A million salat (Muslim prayers) for a new dawn!"

They also demanded the fall of the regime, echoing calls made by demonstrators during the Arab Spring revolts of 2011 which toppled a succession of veteran leaders.

Authorities say 33 people have died since petrol and diesel prices jumped one week ago, sparking the worst protests in the history of President Omar al-Bashir's two-decade rule.

Activists and international human rights groups say at least 50 people have been gunned down, most of them in the greater Khartoum area.

The real toll is difficult to determine but "could be as much as 200," a foreign diplomat told AFP Sunday on condition of anonymity.

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