Updated to include number of known affected customers.
ST. LOUIS COUNTY • Midwest BankCentre has learned of a security breach affecting some customers' personal information late Monday afternoon, the bank announced on its website.
The bank immediately told the Secret Service, which is investigating. The bank reports it has no evidence its security system was breached, but it has asked a forensic firm to investigate the source of the breach, including all of the bank's vendors.
The bank is now contacting all affected customers and will be offering free identity theft protection. Staffers can also answer customer questions.
The bank has seven branches across the St. Louis area.
Because of reports of credit card fraud in the area, including fraud affecting customers of Schnucks supermarkets, the bank is now requiring debit card users making purchases of more than $100 in Missouri or any amount outside the state to enter a personal identification number to authorize the purchase.
The bank encourages customers to monitor account activity, and if you notice any fraudulent or suspicious activity, please report it to them immediately at 314-631-5500 or 1-800-894-1350.