Colonel Sirichan Ngathong, deputy spokeswoman of the Royal Thai Army, said the explosion happened at 11am inside the Jarumanee strategic training facility of the Burachat base in Ratchaburi&rsquo;s Mueang district.

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The sergeant who died in the blast was named as Yutthapong Chankhonkaen, an officer of the 11th Engineering Regiment of the Royal Guards. 
Yutthapong and the injured troops were aboard a boat and were taking part in a drill for demonstrating how to clear mines in water, Sirichan said. 
They were supposed to show the marine mine-clearing technique to a visiting delegation of the engineering corps on Wednesday. 
The injured were rushed to Phanu Rangsi Army Hospital, she added. 
Sirichan said the Army would conduct an investigation to ascertain the cause of the explosion.

Army sergeant killed, 7 troops injured in accidental explosion in Ratchaburi

A mine-clearing drill at an Army base in Ratchaburi resulted in an accidental explosion that killed a sergeant and injured seven other troops, a deputy Army spokesperson said on Tuesday.