BANGKOK -- Armed clashes have broken out between Thailand and Cambodia in long-disputed border areas, rapidly escalating months-long tensions.

A personal feud between two of Southeast Asia’s political titans is inflaming the worst violence on the Thailand-Cambodia border in more than a decade.

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.