Four men broke into Siam Commercial Bank's ATM booth in Chon Buri's Bang Lamung district and escaped with about Bt2.9 million in cash early Tuesday morning.
Police were alerted around 1am about the incident. At the scene, they found the back part of the ATM machine broken down by cutting torch.
A security guard told police that he smelt something was burning at the ATM booth around midnight so he went to check and found four men wearing hood were transferring two money boxes from the booth to their vehicle.
They intended to steal more money boxes but gave up and fled after seeing him, the guard said.
The bank later said that the stolen money was about Bt2.9 million, but would check the exact amount of money again.
Police said the investigation from security camera footage showed that the robbers may be Thais. The robbery was well prepared, police said, there was no alarm signal from the booth to police station so the suspects spent about half an hour to break into the ATM.