Fighting raged Thursday along the border of Cambodia and Thailand, with explosions heard near centuries-old temples ahead of US President Donald Trump's planned phone call to the leaders of both nations.

At least 20 people have been killed in the latest round of border fighting that reignited last week, officials said.

Around 600,000 people, mostly in Thailand, have fled border areas near where jets, tanks and drones have waged battle.

The Southeast Asian nations dispute the colonial-era demarcation of their 800-kilometre (500-mile) frontier, where both sides claim a smattering of historic temples.

This week's clashes are the deadliest since five days of fighting in July killed dozens before a shaky truce was agreed, following intervention by Trump.

The US president said he expected t

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