Prime Minister Malcolm Turnbull hitches a ride in The Beast — the US President's armoured, high-tech fortress on wheels — for an intimate conversation with Donald Trump.

The death toll from heavy rain and flooding in southern Japan rises to 15, officials say, as rescue workers reach isolated villages where at least 14 others are missing and feared dead.

Anti-globalisation activists riot for a second night as Hamburg hosts the G20 leaders, setting up street barricades, looting supermarkets and attacking police with slingshots and petrol bombs.

Tibetan rights groups criticise a United Nations cultural organisation's decision to extend world heritage status to an extensive plateau in a heavily Tibetan area, saying it reinforces Chinese control in the region.

Residents of Hamburg were told that hosting the G20 summit would help promote their city to a worldwide audience, but locals say the violence wrought by thousands of angry protesters has damaged the German city's reputation.