A Thai military police officer inspects the scene of the bomb

Thailand’s prime minister has announced that a second foreign man has been arrested at a checkpoint on the Cambodian border on suspicion of involvement in last month’s deadly shrine bombing.

The announcement on Tuesday was the second confirmed arrest in connection with the August 17 blast that tore through a religious shrine in downtown Bangkok and killed 20 people. The suspect is being flown back to Bangkok from the border by helicopter.

Prayuth Chan-ocha, who also heads the nation’s military government, was asked by reporters to comment on rumours a man had been arrested.

“He has been arrested at Sa Kaeo checkpoint,” Prayuth told reporters, referring to the Thai side of the border, adding: “He is a main suspect and a foreigner.”

The motive for the blast, Thailand’s worst single mass-casualty attack remains shrouded in mystery. (Al Jazeera)