President Donald Trump has doubled down on his suggestion the US should take over Greenland as leaders from the Danish territory criticise a planned trip there this week by a high-profile US delegation.

A Turkish court has jailed Istanbul Mayor Ekrem Imamoglu, President Tayyip Erdogan's main political rival, in a move that has inflamed the country's biggest protests in more than a decade.

The Trump administration on Saturday ended a federal contract that provides legal representation to nearly 26,000 migrant children who entered the United States without a parent or guardian.

London's Heathrow Airport has resumed full operations, a day after a fire knocked out its power supply, but airlines are warning of delays and cancellations as schedules are fixed and passengers rerouted.

Israeli artillery and airstrikes hit south Lebanon on Saturday after Israel said it had intercepted rockets fired from across the border.

Protests against the detention of Istanbul's mayor have grown and turned increasingly tense, Turkey's biggest show of civil disobedience in more than a decade after President Erdogan warned it would not be tolerated.