The Royal Thai Army alleged that Cambodia violated the ceasefire agreement again by attacking Thai soldiers at Phu Makhuea and Chong Anma.

A Thai F-16 fighter jet bombed targets in Cambodia, both sides said, as weeks of tension over a border dispute escalated into clashes on Thursday that have killed at least 12 people, including 11 civilians.

At least 12 people have been killed in border clashes , with both nations deploying fighter jets as the US is urged to intervene

The Cambodian government described the action as a serious violation of international law, including the United Nations Charter and the ASEAN Charter. They added that the Thai aggression "not only endangers peace and stability along our shared border but also demonstrates utter disregard for regional norms and international legal obligations."

Hostilities have spread across six flashpoints along a 209 km border stretch, with initial clashes erupting near the 11th-century Ta Muen Thom temple, between Thailand’s Surin province and Cambodia’s Oddar Meanchey.

Thailand and Cambodia exchanged heavy artillery fire for a second day on Friday as border fighting intensified and spread, while Cambodia's leader said Thailand had agreed to a Malaysian ceasefire proposal but then backed down.

Of course, trouble at the 508-mile (817 km) shared border is nothing new. For over a century, Thailand and Cambodia have contested sovereignty at various undemarcated points in the thick jungle punctuated with culturally-significant temples albeit with scant strategic or economic value.