The Thai military closed its border to nearly all travelers to Cambodia as diplomatic tensions rise over a territory dispute between the two neighboring south Asian nations.

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.

Thailand is imposing new border restrictions including blocking tourists from entering Cambodia as the two countries engage in retaliation in their border dispute.