The US is warning travelers to think twice before booking trips to parts of Southeast Asia. A new advisory highlights rising risks in Cambodia and Thailand, tied to an escalating border conflict that has already claimed dozens of lives.

The U.S. State Department has raised travel advisories for Cambodia and Thailand to level two due to border conflict.

The UK’s Foreign, Commonwealth and Development Office (FCDO) has issued travel advisories to Thailand and Cambodia after the two countries exchanged rocket and artillery fire across several sights.