Thailand has reinforced its military presence along a disputed border with Cambodia, following an increase in troops on the other side, Thailand's defence minister said on Saturday. Tensions between the two Southeast Asian countries have been simmering since a Cambodian soldier was killed on May 28 in a brief conflict in an undemarcated border area.

A key border crossing to Cambodia from Surin province was quiet on Sunday after Thai security authorities ordered officials to sharply reduce operating hours.

The nations seek to defuse tensions following gunfire on May 28 in the disputed Chong Bok border region, resulting in the death of a Cambodian soldier.