At least 56 people have been killed and 595 injured following ongoing clashes between Sudan's army and paramilitary forces.

Axar.az reports the country's doctors trade union said the deaths came during sustained fighting on Saturday, with UK and US embassies in the city both urging their citizens to stay indoors.

They were unable to say how many of the casualties were civilians, but had earlier indicated at least three of the dead were not combatants.

Two people were killed at Khartoum airport, four in neighbouring Omdurman, eight in the city of Nyala, six in the city of El Obeid and five in El Fasher, the source added.