July 25 (UPI) -- At least 16 people have now been killed in a clash between Thailand and Cambodia's militaries along a disputed border region, which entered its second day Friday.

Over 135,000 civilians have been evacuated from the region, officials from both countries said on Friday.

Tensions boiled over Thursday along the 508-mile border shared between the two countries with Thai and Cambodian forces accusing the other of starting the back-and-forth attacks that left at least three civilians dead.

The clashes initially started around the Prasat Ta Muen Thom, an ancient Hindu temple that both sides claim as their own.

Related