Brink's (Thailand) Ltd security staff on a cash-in-transit truck had earlier alerted police that they had lost one of 27 money bags while delivering money to ATM machines of Siam Commercial Bank.
Tossaporn Rewnak, the team leader, said they had failed to lock the back door of the truck, and one of the bags had apparently fallen out. Pongsin said he used to work as a bank employee so he knew right away that the money was supposed to be transported to cash dispensers.