Fighting with heavy weapons broke out Sunday morning for the third consecutive day between Cambodian and Thai troops at the disputed border between the two countries, hours after the UN call for a cease-fire.
According to a Cambodian military official, the clashes resumed around 10:00 local time (0300 GMT) around a disputed group of temples.
A Thai official has confirmed new incidents."Cambodia opened fire first," he added.
As usual, the two neighbors blame the cause of clashes that killed six soldiers and four Cambodian Thai since Friday.
The gunfire was clearly audible 20 km away fighting the Cambodian side, where villagers were evacuated found shelter in schools and temples, according to an AFP photographer.
The UN Secretary General Ban Ki-moon urged the two neighbors to "take immediate steps to implement a cease-fire effective and verifiable," said a spokesman.
Cambodia and Thailand have clashed several times in recent years in the jungle near the ancient temples located on a border that has never been fully demarcated, partly because of mines left by decades of civil war in Cambodia.
Phnom Penh on Saturday accused the Thai army have used "heavy weapons containing poison gas," that the Thai authorities have denied.
Thai Prime Minister Abhisit him Sunday accused its neighbor of wanting to "internationalize" the conflict.
Cambodia calls since the latest fighting in February mediation to resolve the border disputes, but Bangkok urges bilateral talks.
After these clashes, the two countries had given their agreement to send observers to the border, after mediation organized by the Association of Southeast Asian (ASEAN) in February.
But since the Thai military said that these observers were not welcome and they were never deployed.
The fighting of February 4 to 7, which had ten dead, including civilians, were held in more than 100 km further east, near the Khmer temple of Preah Vihear.
These ruins of the eleventh century, whose classification by UNESCO in 2008 had rekindled tensions within the sovereignty of Cambodia by a ruling of the International Court of Justice in 1962.
But the Thais its main access control, and both countries claim an area of 4.6 km2 below the building that has not been delineated.
