Three privates were wounded, two seriously, in when M72 anti-tank rocket exploded in front of an ammunition depot of the 3rd Infantry Battalion of the 1st Infantry Regiment on Rama V road in Bangkok's Dusit district on Sunday morning, the army spokesman said.
Col Sansern Kaewkamnerd said the incident occurred at about 11am during a routine clean-up of military equipment.
However, what caused the rocket to explode was still not clear. The explosion could have been caused either by excessive heat or human error. A committee would be set up to investigate, he said.
Maj-Gen Varah Boonyasit, commander of the First Division, and Col Ekarat Changkaew, commander of the 1st Infantry Regiment, said the committee would establish the cause of the explosion.
Of the three injured, Pvt Bundhit Wijitsak was wounded in the right leg and Pvt Kittipat Pakjangreed in the left arm and hand. They were admitted to King Mongkut Hospital.
Pvt Chakri Chaiyarang was slightly wounded in the torso. He was released after receiving first-aid treatment.
It was reported earlier that only two were wounded in the explosion.