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.

Tensions along Cambodia's northern border with Thailand have been simmering since May, when a Cambodian soldier was killed in a clash with Thai forces.

Thailand claims the ordnance was newly laid, but Cambodia says they are leftovers from a final stint of fighting during the murderous Khmer Rouge regime. Still, soon after the incident, both sides downgraded relations, expelled their neighbour’s ambassador and recalled embassy staff.

Indian travellers are advised to avoid Thailand-Cambodia border regions amid armed clashes. Martial law is enforced in parts of Thailand. Embassies in both nations have issued emergency contacts and urged vigilance.