Thailand says it has bombed a "logistics centre" near the Cambodian town of Poipet, known for being a major casino hub and the biggest land crossing between the two countries.

The bombings come as renewed border clashes show no sign of abating.

Cambodia's defence ministry said Thai forces dropped two bombs, while the Thai side said that they targeted a facility storing rocket systems.

The renewed fighting this month has killed at least 21 people in Thailand and 17 in Cambodia, while displacing around 800,000, officials say.

In a statement, the Cambodian defence ministry said Thai forces dropped two bombs in the area of Poipet municipality at around 11:00 am (0400 GMT) Thursday.

Shortly after, Thai Air Force spokesman Air Marshal Jackkrit Thammavichai said that the Thai military had attacked the centre outside Poipet that had been used to store BM-21 rockets and that no civilians were harmed.

BM-21 rockets are weapons that are typically fired in volleys from the back of an armoured vehicle.

The bombings appear to be the first on Poipet, which is known for casinos popular with Thai gamblers and its international border checkpoint.

On Tuesday, Thailand said Tuesday that between 5,000 and 6,000 Thai nationals remained stranded in Poipet after Cambodia closed its land border crossings between the two countries.

Cambodia's interior ministry said the border closures were a "necessary measure" to reduce risks to civilians, adding that air travel remained an option for those seeking to leave.

The century-old border dispute between the South East Asian neighbours dramatically escalated on 24 July with a Cambodian rocket barrage into Thailand, followed by Thai air strikes. That set off five days of intense fighting, which left dozens of soldiers and civilians dead.

The two countries later agreed to an "immediate and unconditional ceasefire" brokered by Malaysian Prime Minister Anwar Ibrahim and US President Donald Trump - who at the time threatened to stop tariff negotiations until the hostilities stopped.

But that ceasefire fell apart again last week, with both sides blaming each other for re-igniting the fighting, which has seen air strikes and exchanges of artillery fire.

Trump claimed last week that he could stop the fighting between Thai and Cambodian forces that broke out by just picking up the phone, but it has continued.

Earlier this week, Cambodia accused Thai forces of bombing Siem Reap province, home to the ancient Angkor temples - the country's top tourist draw - for the first time in the latest round of clashes.