The FBI warned banks Friday that a criminal group would imminently try to make massive, fraudulent withdrawals from ATMs, according to reporter Brian Krebs.

What they're saying: “The FBI has obtained unspecified reporting indicating cyber criminals are planning to conduct a global Automated Teller Machine (ATM) cash-out scheme in the coming days, likely associated with an unknown card issuer breach," the FBI wrote to banks, according to Krebs. The FBI advised banks to increase security on a number of fronts, including monitoring their own networks for unusual traffic.