Thailand said its navy joined the army in repelling Cambodian attacks on a new frontier in their disputed border, as the death toll from the escalating conflict climbed to at least 30.

The naval operation early on Saturday followed the incursion of Cambodian troops at three different points in Trat province in Thailand’s east, the Thai Defense Ministry said in a statement. The marine forces’ counter-operation was able to push back Cambodian soldiers encroaching on Thai territory, it said.