A ceasefire between Thailand and Cambodia appeared shaky but remained in place Tuesday as tensions lingered despite a truce agreement to end deadly border clashes following economic pressure from the U.

Cambodia and Thailand each said the other had launched artillery attacks across contested border areas early on Sunday, hours after U.S. President Donald Trump said the leaders of both countries had agreed to work on a ceasefire.

President Trump said Monday he spoke to the prime ministers of Thailand and Cambodia after the two nations agreed to a ceasefire ending five days of fighting in the region. “Just spoke to the Acting Prime Minister of Thailand and Prime Minister of Cambodia.