Cambodia has accused Thailand of escalating border tensions by imposing new restrictions that have blocked almost all land crossings, especially for tourists heading into Cambodia.

The reescalation of conflict was sparked on May 28, when a Cambodian soldier was killed in an early morning clash between both nations’ troops, in an area called the Emerald Triangle—the shared border between Thailand, Cambodia, and Laos. The area remains disputed as both Thailand and Cambodia lay claims to parts of the region.

Dozens of tourists and workers, some carrying children, were left stranded on Tuesday at Thailand's main land crossing with Cambodia, after the army stopped almost all border traffic in an