A deadly military clash along Thailand and Cambodia's shared border is escalating, with airstrikes carried out by the Thai army.

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.

Clashes between Thai and Cambodian troops at their disputed border have killed at least 12 people, Thai authorities say. The fighting marks an escalation of a dispute between the two South East Asian neighbours that dates back more than a century.

BANGKOK -- Armed clashes have broken out between Thailand and Cambodia in long-disputed border areas, rapidly escalating months-long tensions.