New Delhi, July 29 -- Thailand and Cambodia agreed Monday to an unconditional ceasefire during a meeting in Malaysia, in a significant breakthrough to resolve five days of deadly border clashes that have killed dozens and displaced tens of thousands.

Cambodian Prime Minister Hun Manet and Thai Acting Prime Minister Phumtham Wechayachai agreed to a halt in fighting, starting at midnight, while appearing with Malaysian Prime Minister Anwar Ibrahim during a meeting held under U.S. pressure in the Malaysian administrative capital of Putrajaya. The Cambodian and Thai leaders hailed the meeting's outcome and shook hands at the end of a brief news conference.

An Associated Press journalist in Cambodia reporting from close to the border with Th...