Patriotic Thais queued to donate blood for their countrymen injured in border clashes with neighbouring Cambodia.

Footage shows long lines of locals waiting to take part in the blood drive at the Thai Red Cross Society in Bangkok, on July 25.

Resident Fuji Shanya said: 'I rushed to the Red Cross Society after seeing the announcement on Facebook that they needed blood. But when I arrived, the officers told me slots were full and they already had more than enough. There must have been more than 100 people who donated.'

The escalating military confrontation - the bloodiest in more than a decade - flared in long-disputed border areas as Thailand and Cambodia accused each other of instigating the violence on July 24.

The Thai army claimed the clash began when six armed Cambodian soldiers approached a Thai outpost after a drone was heard near a disputed Khmer temple. Thai troops said they shouted warnings and claimed the Cambodians opened fire first.

However, Cambodia's Defense Ministry accused Thailand of provoking the violence, saying its forces acted in self-defense.

Officials said at least 38 people have been killed and more than 300,000 displaced on both sides of the border.

Both side have reached a truce midnight on Monday, following talks facilitated by Malaysian Prime Minister Anwar Ibrahim, chair of the Association of Southeast Asian Nations (ASEAN).

He said: 'This is a vital first step toward de-escalation and the restoration of peace and security.'

US President Donald Trump had earlier threatened to pause trade deals with both countries if clashes continued.

He said after the ceasefire was forged: 'By ending this War, we have saved thousands of lives ... I have now ended many Wars in just six months — I am proud to be the President of PEACE!'