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 are engaged in their worst fighting in over a decade, exchanging heavy artillery fire across their disputed border, with at least 16 people killed and tens of thousands displaced.

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

The Indian Embassies in Cambodia and Thailand have issued advisories urging Indian nationals to avoid border areas due to ongoing armed clashes. Tensions have escalated, leading to a humanitarian crisis with mass displacement.

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.