Why are Thailand and Cambodia fighting at the border?

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

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At least five Thai soldiers and seven Cambodian civilians have been killed since Monday, with the countries accusing one another of starting the violence.

The clashes, which have also seen Thailand launch airstrikes along the border, are the most serious since the ceasefire was agreed in July.

This is not a recent dispute. The argument between Thailand and Cambodia dates back more than a century, when the borders of the two nations were drawn after the French occupation of Cambodia.

Hostilities escalated in 2008, when Cambodia tried to register an 11th Century temple located in the disputed area as a Unesco World Heritage Site. The move was met with heated protest from Thailand.