CCTV footage has been released showing riot police beating a man in Khartoum, Sudan.

The video was released on Sunday, the same day Sudanese security forces dispersed protesters marching towards the Presidential Palace in Khartoum, Reuters reported.

Teachers and students at the University of Khartoum were arrested to prevent them partaking in other demonstrations, the Sudan Times has said.

Sudanese riot police fired tear gas at protesters in the city centre, according to local reports.

Rising prices triggered anti-government protests in December, and security forces responded by firing tear gas and live ammunition.

Nineteen people had been killed in the protests by 27 December, officials have estimated. But Amnesty International has reported a higher figure, of 37 dead.