Thailand warned its conflict with neighboring Cambodia could “potentially develop into a war” as troops used rockets and artillery to shell targets along their contested border for a second

Tensions along Cambodia's northern border with Thailand have been simmering since May, when a Cambodian soldier was killed in a clash with Thai forces.

U.S. Secretary of State Marco Rubio spoke with the foreign ministers of Cambodia and Thailand on Sunday, urging them to immediately deescalate tensions and telling them the United States was ready to help with talks,