Why are Thailand and Cambodia fighting at the border?

The roots of the South East Asian neighbours' dispute goes back to more than a century ago.

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At least 12 Thai nationals, most of whom are civilians, have been killed, Thai authorities have said.

How many people - if any - have lost their lives on the Cambodian side is not known.

Each side is blaming each other for causing the escalation, which reportedly began with gunfire over the border.

Thailand has accused Cambodia of then firing rockets, while Bangkok carried out air strikes on Cambodian military targets.