At least 15 people killed, while more than 500,000 people have fled border areas near where jets, tanks and drones were waging battle

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.