Fighting has flared up several times this year since a Cambodian soldier was killed in a May skirmish, as decades-old tensions over the border territory persist.
Thailand has announced a curfew as fighting with Cambodia spread to more areas of a disputed border region.
Renewed conflict between the southeast Asian neighbours has stretched into a second week, despite claims of a ceasefire by would-be peacemaker, US President Donald Trump.
Thailand’s curfew covers five districts of Trat province that neighbour Koh Kong, excluding the tourist islands of Koh Chang and Koh Kood.
This is in addition to the curfew the military previously imposed in the eastern Sakeo province, which remains in force.
Around two dozen people have been killed in the past week, according to official reports.
The renewed fighting ended a July ceasefire that was brokered by Malaysia and pushed through under pressure from Mr Trump, who threatened to withhold trade privileges unless the two sides agreed.
On Friday, Mr Trump said the two countries “agreed to CEASE all shooting effective this evening, and go back to the original Peace Accord made with me” on his Truth Social platform.
However, fighting has continued this weekend.