Kelantan police chief Yusoff Mamat said security along the Malaysia-Thailand border will be tightened following the incident.

“All police station chiefs and the General Operations Force have been ordered to step up control in high-risk areas, especially illegal entry points, with round-the-clock surveillance,” he said.

Thai police said an explosion occurred at a security control post outside the Sungai Golok district office on Jalan Sungai Golok-Sungai Padi, and that several shots were fired by a group of assailants, killing at least two Thai security personnel and injuring another eight during an attack at about 7.10pm.

The group was said to have thrown about five grenades in the attack.

Thai authorities in Sungai Golok have been stepping up security in the district since the start of Ramadan.