"Cambodia asked for an immediate ceasefire - unconditionally - and we also call for the peaceful solution of the dispute," said Phnom Penh's UN ambassador.

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.

The first clash on Thursday morning took place near the ancient Ta Muen Thom temple along the border of Thailand's Surin province and Cambodia's Oddar Meanchey province, the AP reported.