The FBI warned banks that hackers are preparing to steal millions of dollars from ATMs in a digital heist that could occur any day now, according to a report by blogger Krebs on Security.

“The FBI has obtained unspecified reporting indicating cybercriminals are planning to conduct a global Automated Teller Machine cash-out scheme in the coming days, likely associated with an unknown card issuer breach and commonly referred to as an ‘unlimited operation,’” the confidential warning the FBI shared only with banks on Friday, and obtained by Krebs on Security, supposedly stated.

The report explained that cyber crooks could hack the banks or the card processing systems to clone cards. The hackers could then change account fraud controls, maximum withdrawal limits and even the amount of money in each account. And that would allow the criminals to withdraw large sums of cash from ATMs around the world.

This kind of a cyberheist usually targets small-to-medium size banks, because they are typically less secure compared to larger financial institutions, Kerbs on Security reported.

Read more at NY POST.