This is the shocking moment violent Thai teens allegedly attacked innocent Cambodians amid escalating border clashes.

Footage shows the nationalist hooligans beating a man on a street in Bangkok on Thursday evening, hours after rockets killed 14 civilians.

Another individual was seen lying unconscious on the ground as the gang continued pummeling the Cambodian national who was trying to escape.

Cambodian troops reportedly fired continuous artillery rounds using 122mm rockets from BM-21 rocket launchers at residents in Surin, where one civilian was killed and a five-year-old child and his family were severely injured. Seven soldiers were also injured in the rocket strike.

The Thai army closed all border checkpoints at 8 am, while the Ministry of Foreign Affairs was instructed to compile evidence of the alleged provocations from the Cambodian side to lodge a formal complaint with international organisations.

The Royal Thai Embassy in Phnom Penh has advised Thai residents in Cambodia to leave as soon as possible. It also urged the public to avoid non-essential travel to Cambodia until the situation is resolved.

The Cambodian Ministry of National Defence condemned Thailand for alleged encroachment.

Prime Minister Hun Manet said Cambodia 'had no choice' but to respond with its armed forces against 'armed aggression'.
The clash flared several days after a border landmine exploded, injuring three Thai soldiers, including one who lost a leg.
Tensions between Thailand and Cambodia escalated after a clash between troops from both countries in a disputed area in Nam Yuen district, Ubon Ratchathani, on May 28, resulting in the death of a Cambodian sergeant.

Thailand expressed its intention to resolve the dispute through existing bilateral mechanisms. However, Cambodia vowed to take the case before the International Court of Justice in The Hague.

Thailand and Cambodia have a complex and often fractious history. The Khmer Empire, a precursor to modern-day Cambodia, once stretched across much of Southeast Asia before the ancient leaders moved their base south to Phnom Penh in the 16th century amid water shortages. The Siamese kingdom then took over the abandoned land.

Thai leaders later supported Germany and Japan in WWII, before aiding the Americans in the bombing of Vietnam, Cambodia and Laos. They then helped the genocidal Khmer Rouge and provided sanctuary for their fugitive leaders.