Thailand and Cambodia traded accusations of fresh attacks Saturday as deadly border clashes entered a third day and President Donald Trump joined a chorus of international voices calling for a ceasefire.

Thailand and Cambodia have exchanged fire on their border in a sharp escalation of a conflict that killed at least 12 people, mostly civilians and including two children aged eight and 15.

Thailand and Cambodia have exchanged accusations over recent clashes at their shared border, resulting in fatalities and displacements. International pressure for a ceasefire is intensifying, with ASEAN urged to mediate.

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.

Thailand and Cambodia exchanged heavy artillery fire for a second day on Friday as border fighting intensified and spread, while Cambodia's leader said Thailand had agreed to a Malaysian ceasefire proposal but then backed down.

Thailand bombed Cambodia with F-16 fighter jets on Thursday, as relations between the two countries imploded following clashes on a disputed border near the Emerald Triangle.

SISAKET, Thailand / WASHINGTON >> President Donald Trump said today that the leaders of Cambodia and Thailand had agreed to meet immediately to quickly work out a ceasefire, as he sought to broker peace after three days of fighting along their border.