Thailand and Cambodia exchanged artillery fire for a fourth day on Sunday, the Cambodian defence ministry said, despite growing talk of a possible ceasefire.

Journalists in the Cambodian town of Samraong, around 20 km (12 miles) from the border conflict zone, heard the regular thump of artillery from dawn, tallying with a ministry spokeswoman’s statement that clashes began near two disputed temples around 4.50 am.

That was despite both countries saying they were open to ceasefire talks following a series of social media posts by US PresidentDonald Trump on Saturday, as he sought to broker peace after three days of fighting along their border.

“Both Parties are looking for an immediate Ceasefire and Peace,” Trump wrote as he gave a blow-by-blow account of his diplomatic efforts.

Thailand said late on Saturday that it agreed in principle to entering a ceasefire with Cambodia and beginning a “bilateral dialogue” aimed at ending the nations’ deadliest fighting in more than a decade.