CCTV shows a car bomb being detonated near a police base in Thailand's terrorism-ravaged southern border on Saturday evening.

The bomb, hidden inside a sedan, exploded at the Orakan junction close to a railway and the the 9313 ad-hoc police base in Su-ngai Kolok, Narathiwat province bordering Malaysia at around 8 pm on August 5.

A person was seen on CCTV footage abandoning the car on the road and hopping onto a motorcycle with another rider to escape just minutes before the bomb was detonated amid heavy rain.

Authorities inspected the scene and found the debris of the car, including the license plate, scattered in a radius of around 100 metres.

The area was closed off as a bomb disposal unit and forensic police examined the site.

Authorities said on August 6 that they found a 10kg cooking gas cylinder at the scene and believe it could have been another bomb that had failed to explode.

The yellow Toyota's registration was traced to Songkhla province and officers were checking its records.

Police said they also discovered eight 9mm pistol shells around 40 metres away from the police base. They said shots were fired and a pipe bomb was hurled at the police base while the suspects were fleeing.

Authorities believe the blast was meant to create alarm as the car bomb was not placed in a crowded area.

The explosion comes just two days after another bomb was detonated in Thailand's deep south, killing one soldier and injuring five others in Pattani province.

Islamic separatist terror attacks target the three southernmost provinces of Thailand - Yala, Pattani and Narathiwat - next to the border with Mulsim neighbors Malaysia. Thai state employees and infrastructure are often hit while attacks on civilians are rare.

Officials believe the conflict dates to a deal in 1909 that the British Empire struck to incorporate the Muslim region into the Siamese mainland.

The region's culture is more similar to Malaysia and dramatically different to Buddhist Thais causing decades of tension that lead to the emergence of separatist groups fighting for independence in the 1960s.

The struggle has continued ever since with more than 7,344 people killed and 13,641 injured between January 2004 and March 2022.

The British Foreign & Commonwealth Office warns against all but essential travel to the region while Canada's government warns its nationals to 'avoid all travel' to the three provinces.