Following the fire report at about 8am, Muang Pattaya Police Station investigation superintendent Colonel Chatchapil Pattarasiriporn contacted the Fire Department and five fire engines were dispatched.
It took firefighters about 30 minutes to extinguish the blaze, which destroyed the inside of the Rock Street Pattaya club.
A cleaner told police she heard the transformer in front of the shop explode three times before the flames spread quickly in the business and she and fellow workers fled the building and alerted police.