Thai drones blasted a Cambodian military camp amid escalating border clashes.

The Thai military bombarded the Ban Sam Lang base near Trat province with artillery fire on December 9.

Footage shows structures set ablaze by the strikes at 5 pm local time. Local media reported that the attack was followed by an exchange of gunfire that lasted five minutes.

The Trat Marine Corps Task Force said troops were unable to seize the camp as Cambodian soldiers were using trenches for cover.

Both nations traded blame for triggering the renewed fighting that erupted on Monday.

The Thai military said that four of its soldiers have been killed and 68 wounded, while the Cambodian defence ministry said nine of its civilians have killed and 20 injured since the skirmishes resumed.

Thailand and Cambodia have been fighting for more than a century over several undemarcated sections of their 817-kilometre (508-mile) border, which was originally mapped by France in 1907 while Cambodia was still its protectorate.

But tensions flared in the long-disputed frontier as both accused each other of instigating violence on July 24, which killed at least 48 and temporarily displaced some 300,000 on both sides of the border.

Cambodia claimed responsibility for the alleged war crime of firing rockets into Thailand that struck a gas station, killing a number of children.

The two nations have reached a shaky truce following talks facilitated by Malaysian Prime Minister Anwar Ibrahim, chair of the Association of Southeast Asian Nations (ASEAN).

But the peace deal, brokered by US President Donald Trump, fell through as Thailand accused Cambodia of laying fresh landmines that have maimed soldiers along the disputed frontier.