Cambodia and Thailand exchanged fire across their disputed border for a fourth day on Sunday, hours after US President Donald Trump announced the two Southeast Asian nations had agreed to ceasefire talks and threatened continued fighting would jeopardize their trade deals with Washington.

Following up on calls by President Trump, Secretary of State Marco Rubio spoke with his counterparts in both countries. But on Sunday morning, skirmishes erupted once more.

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.