Thailand and Cambodia exchanged fire along their disputed border for a second day on Friday, officials from both countries said, with more than a dozen people reported killed and more than 135,000 civilians evacuated.

Thai and Cambodian soldiers have clashed along the two countries' border in a major escalation of a festering dispute over territory that killed least 14 people, mostly civilians.

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.

Acting Thai Prime Minister Phumtham Wechayachai accused Cambodia of laying new landmines in the disputed area, resulting in an injury to a Thai soldier.

The fighting has killed at least 14 people in Thailand, while Cambodia confirmed its first fatality on Friday.