Thai troops unleashed an evening bombardment on Cambodian forces as clashes raged along the disputed border.

Thai forces pounded a casino and nearby homes near Trat province with a barrage of artillery and drone strikes on December 10.

Nighttime footage shows explosions ringing out in the darkness as the salvo struck the disputed area.

Fighting flared up on Sunday as the Thai army claimed Cambodian troops fired on a Thai engineering team building an access road in a disputed border area.

Officials said at least five Thai soldiers have been killed while more than 500,000 people have been displaced in the most recent clashes. Cambodian casualties are understood to be significantly higher.

Cambodia's assault has largely been wayward, unguided rockets fired indiscriminately into Thai territory, while Thailand has used precision drone strikes and fighter jet strikes on military sites.

The BBC has reported that Thailand has provided 'compelling evidence' that Cambodia has also 'laid new landmines in bad faith' that have continued to injure Thai soldiers along the border.

Former Khmer Rouge henchman and Cambodian dictator Hun Sen - who was a leading figure in the genocide of his own people in the 1970s before assuming power in 1985 and overseeing the murder of thousands of opposition figures and critics - has repeatedly claimed that he wants peace and that Thailand is the aggressor.

Thai officials claim the ongoing border confrontations are a threat to national security, and the areas must be secured.