Sudan imposes curfew in port city after ethnic clashes

A curfew has been imposed in Sudan's main seaport, Port Sudan, following ethnic fighting which left more than 30 people dead.

About 100 people were wounded, including members of the security forces.

There have been several days of clashes between the Nuba and Beni Amer tribes, which have a long history of violence.

The two groups signed a peace deal last September after fierce fighting.

Sudan's transitional government faces many challenges, including an economic crisis and insecurity in several regions.