Half a million evacuees in Cambodia and Thailand were sheltering in pagodas, schools and other safe havens on Wednesday after fleeing renewed fighting in a century-old border dispute in which US President Donald Trump has vowed to again intercede.

At least 11 people, including Thai soldiers and Cambodian civilians, have been killed in the latest spate of fighting, officials said, while more than 500,000 have fled border regions near where jets, tanks and drones were waging battle.

The Southeast Asian neighbours dispute the colonial-era demarcation of their 800-kilometre (500-mile) frontier, where competing claims to historic temples have spilled over into armed conflict.

This week's clashes are the deadliest since five days of fighting in July that killed dozens and displaced around 300

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