Thailand and Cambodia traded accusations Saturday of fresh attacks as deadly border clashes entered a third day, leaving at least 33 people dead and more than 168,000 displaced, as international pressure mounted on both sides to reach a ceasefire.

The first clash on Thursday morning took place near the ancient Ta Muen Thom temple along the border of Thailand's Surin province and Cambodia's Oddar Meanchey province, the AP reported.

Thailand and Cambodia are engaged in their worst fighting in over a decade, exchanging heavy artillery fire across their disputed border, with at least 16 people killed and tens of thousands displaced.

BANGKOK -- Armed clashes have broken out between Thailand and Cambodia in long-disputed border areas, rapidly escalating months-long tensions.

"The U.S. already flunked the test and that should be a wakeup call," a former senior U.S. State Department official told Newsweek.

By Shoon Naing, Artorn Pookasook and Susan Heavey SISAKET, Thailand/WASHINGTON (Reuters) -U.S. President Donald Trump said on Saturday that the leaders of Cambodia and Thailand had agreed to meet immediately to quickly work out a ceasefire,

The tank screeches as it rolls into the ad-hoc military base before four battle-weary soldiers jump out to re-inspect the hefty vehicle.