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President Trump has replaced his Homeland Security secretary, Kirstjen Nielsen, thanking her for her service. He gave no immediate reason for the change, but there has been talk of tensions between the pair for months. Ms Nielsen's departure follows growing presidential anger at the failure to reduce the number of migrants entering the United States illegally across the Mexican border.

The United States has demanded an immediate halt to an offensive by the Libyan warlord Khalifa Haftar on the capital, Tripoli. The Secretary of State, Mike Pompeo, said the US was continuing to press Libyan leaders to return to political talks mediated by the United Nations. Four days of fighting around Tripoli are reported to have left more than twenty people dead: the UN says its call for a humanitarian pause was ignored.

Anti-government demonstrations are continuing for a second night in the Sudanese capital, Khartoum, and its twin city, Omdurman. Eyewitnesses say car tyres were set alight as protestors marched in several streets. Thousands of protesters have been outside Sudan鈥檚 military headquarters since Saturday, pledging not to disperse until President Omar al-Bashir resigns.