President Trump said on Saturday that both countries had agreed to a halt in the fighting. But on Sunday morning, skirmishes erupted once more.

Thailand’s Foreign Ministry confirmed Trump’s call with acting Prime Minister Phumtham Wechayachai. “However, Thailand would like to see sincere intention from the Cambodian side,” it said. The ministry reiterated its call for bilateral talks between the two sides.

Both nations accused each other of starting the military clashes and have downgraded their diplomatic relations since Wednesday. Thailand also sealed all land border crossings with Cambodia.