Thailand's military has closed border crossings into Cambodia to almost all travellers, including tourists and traders, citing security concerns as tensions between the two Southeast Asian neighbours remain escalated over a simmering border dispute.

Thailand and Cambodia shut several border crossings in tit-for-tat moves, ratcheting up tensions between the two Southeast Asian neighbors as Prime Minister Paetongtarn Shinawatra fights to save her government from a political crisis triggered by a leaked phone call over the weekslong standoff.

Thailand's army has put curbs on border crossings with Cambodia in six provinces, as a territorial row between the neighbours rages. Relations have deteriorated after a Cambodian soldier was killed last month when troops exchanged fire in a disputed area known as the Emerald Triangle.