United Nations Secretary General, Ban Ki-moon, has urged Cambodia and Thailand to call a ceasefire, after 10 soldiers were killed in two days of clashes on their common border.
The fighting took place in a jungle area claimed by both countries just west of the disputed Preah Vihear temple, where deadly clashes erupted in February.
Mr Ban says the dispute cannot be solved by military means and both sides needed to engage in "serious dialogue".
Thousands of villagers evacuated from their homes because of the fighting were sheltering in camps on either side of the porous border reports the BBC.
Following February's fighting near the 900-year-old Preah Vihear temple an informal truce had appeared to be holding.
Indonesia, which has been trying to broker a lasting peace deal between the two neighbours, has also called for an immediate ceasefire.