Half a million evacuees in Cambodia and Thailand were sheltering in pagodas, schools and other safe havens on Wednesday after fleeing fresh border clashes while US President Donald Trump vowed to intercede to stop the fighting.

At least 15 people, including Thai soldiers and Cambodian civilians, have been killed in the latest hostilities, officials said, while more than 500,000 people have fled border areas near where jets, tanks and drones were waging battle.

AFP journalists in northwestern Cambodia's Samraong town on Wednesday morning heard the blasts of incoming artillery from the direction of centuries-old temples in disputed border areas.

By the afternoon, hundreds of families were leaving a shelter at a pagoda near Samraong where they had been staying since Monday.

"Authorities s

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