More than 100,000 people have been displaced in the deadliest conflict between the two nations in 14 years. Thailand’s acting prime minister warned on Friday that clashes with Cambodia over a border dispute “could develop into war” as the deadliest fighting between the two countries in years extended into a second day.

The current conflict between Cambodia and Thailand is a deeply troubling development in Southeast Asia. The recent clashes along the shared border between the two countries have reignited an old territorial dispute that had previously remained contained to diplomatic disagreements and minor skirmishes.