An officer was injured by an alleged terrorist explosion in Thailand's deep south today.

Sergeant Major First Class Charoen Petchpimol was on patrol when suspected insurgents detonated an IED along Highway No. 4013 in Narathiwat province at around 12:15 pm.

Video shows the officer's damaged pickup truck, with dirt and rocks littering the highway following the explosion.

He was rushed to a hospital, and the area was cordoned off by authorities. No civilians were injured in the blast.

The blast comes after a motorcycle rigged with explosives was detonated near a checkpoint, injuring four people in the same province on May 6.

While on April 26, around 20 suspected terrorists invaded the Pracharat Biomass Mae Lan Co Ltd plant in Pattani, holding seven workers and two security officers at gunpoint. 

They released all hostages before detonating explosions, damaging the power plant.

Islamic separatist terror attacks target the three southernmost provinces of Thailand - Yala, Pattani and Narathiwat - next to the border with Mulsim neighbours 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.