Five security officers have been killed during a search in Sudan's capital Khartoum targeting a cell linked to the Islamic State (IS) group, the authorities say.

The country's intelligence service said 11 foreign militants of different nationalities had been arrested.

There was no immediate mention of any incident in Khartoum by online platforms linked to the militant group.

The group has never claimed any attacks in the country but the US has warned of the possible arrival in Sudan of militants.