The video clips purported to show crowds of several hundred each gathering on side roads and heading toward the palace in the heart of Khartoum, the capital. They sang patriotic songs and chanted “Freedom,” “Peaceful, peaceful against the thieves” and “The people want to bring down the regime.” The latter was the most popular slogan of the 2010 and 2011 Arab Spring revolts.

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One clip showed what appeared to be the body of a protester being carried away. Earlier images circulated by activists showed police snipers on roofs near the palace ahead of the march.

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No reliable casualty figures were available.

The march’s organizer, an umbrella of independent professional unions, said at least eight protesters were shot, with three in serious condition.

They said hundreds were hurt when police hit them with batons or used tear gas to disperse them.

Large numbers of security personnel were deployed across much of Khartoum on Tuesday in anticipation of the march. Police dispersed marchers, only for the crowds to assemble again and try to continue the march in pitched battles.

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Activists said the clashes continued after nightfall.

Tuesday’s march followed nearly a week of protests that were initially sparked by rising prices and shortages of food and fuel but later escalated into calls for the departure of Bashir, who seized power in a 1989 military coup.

The march followed a joint statement late Monday by the United States, Britain, Norway and Canada, which said they were concerned by “credible reports” that Sudan’s security forces have used live ammunition against demonstrators. They urged all parties to avoid violence or the destruction of property while affirming the right of the Sudanese people to peacefully protest to express their “legitimate grievances.”

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The London-based rights group Amnesty International, meanwhile, said it had “credible reports” that Sudanese police killed 37 protesters in clashes during the demonstrations.