Both sides have accused each other of violating international law as they await a promised phone call from Donald Trump.

Renewed fighting between Thailand and Cambodia has entered its fourth day, with both sides accusing one another of violating international law, as they await a promised phone call from United States President Donald Trump.

Cambodia’s Ministry of Defence accused Thailand’s military of carrying out numerous attacks within the country in the early hours of Thursday morning, including deploying tanks and artillery to strike targets in the country’s Pursat, Banteay Meanchey, and Oddar Meanchey provinces.

In one such attack, Cambodia accused Thai soldiers of violating international humanitarian law by firing on civilians in Prey Chan village in Banteay Meanchey province.

In another, it accused Thai forces of shelling “into Khnar Temple area”, and said Thai forces had also “fired artillery and support fire into the O’Smach area”.

“Cambodia urges that Thailand immediately stop all hostile activities and withdraw its forces from Cambodia’s territorial integrity, and avoid acts of aggression that threaten peace and stability in the region,” the Defence Ministry said.

Clashes took place on Wednesday at more than a dozen locations along the contested colonial-era demarcated 817-kilometre (508-mile) Thai-Cambodian border, with some of the most intense fighting being reported since a five-day battle in July, which saw dozens killed on both sides.

Cambodia’s Ministry of the Interior said homes, schools, roads, Buddhist pagodas and ancient temples had been damaged by “Thailand’s intensified shelling and F-16 air strikes targeting villages and civilian population centres up to 30km [18.6 miles] inside Cambodian territory”.

“It should be noted that … these brutal acts of aggression of the Thai military indiscriminately opened fire targeting civilian areas, especially schools, and further destroyed Ta Krabey and Preah Vihear temples, the highly sacred cultural sites of Cambodia and the world cultural heritage,” it said.

The ministry added that, as of Wednesday, the death toll on the Cambodian side of the border stands at 10 civilians, including one infant, while 60 people have been injured.

Responding to the accusations, the Thai army said Cambodia had “intentionally” used a historical site as a “military base of operations” and therefore was guilty of violating international law.

“Cambodia intentionally used the ancient site for military operations, as a base to attack Thailand, and deliberately undermined the protection of the ancient site. Thailand retaliated as necessary,” the Thai army said.

Eight Thai soldiers have also been killed in the fighting so far this week, with 80 more wounded, it said.

Both sides have blamed one another for reigniting the conflict, which began on Monday and has expanded to five provinces across Thailand and Cambodia, according to a tally by the AFP news agency.

More than 500,000 Thai and Cambodian civilians have been forced to flee border areas due to fighting.

It was only on October 26 that Trump presided over the signing of a ceasefire between the Southeast Asian neighbours in Kuala Lumpur, Malaysia. Hailing the deal, which was also brokered by Malaysian Prime Minister Anwar Ibrahim, Trump said mediators had done “something that a lot of people said couldn’t be done”.

Optimistic of securing another peace deal, Trump told reporters on Wednesday that “I think I can get them to stop fighting”.

“I think I’m scheduled to speak to them tomorrow,” he added.