At least 57 Petaluma area residents have had thousands of dollars siphoned from their bank accounts after using self-checkout lines at the Lucky Supermarket on Lakeville Highway, according to police.
A trickle of reports over the weekend turned into a deluge Monday morning, with more than 40 people filing police reports throughout the day.
Despite initial denials by Lucky's corporate owner that the Petaluma store had been targeted by thieves, police said they had little doubt about where the account information had been stolen.
"We're being really specific to ask &‘Where have you been using that card?' and Lucky is the common denominator," Sgt. Steve Nelson said.
The average loss appears to be about $500, often happening in $300 and $200 increments to get around ATM withdrawal limits, Nelson said.
The thefts have occurred all over the region, including San Francisco, Santa Barbara, Northridge and Reno, Nelson said. That tells him that a very organized, sophisticated group is behind the scam.
A spokeswoman for Modesto-based Save Mart Supermarkets initially said Monday the Petaluma store was not one of the 20 locations where "skimming" devices had been found hidden in ATM/credit card readers on self-checkout lines in November.
But late in the day, spokeswoman Alicia Rockwell acknowledged that stores in Petaluma, Novato and Sunnyvale had also been hit, pushing the total to 23. She said a "breakdown in communication" had occurred between company officials and the technicians who combed all 68 Lucky stores in Northern California after the first devices were found Nov. 11.
"Obviously, this is changing by the minute," Rockwell said.
The company's Nov. 23 alert assured shoppers the breach had occurred at only 20 of its stores and said the grocery chain was unaware of "any reports that customer accounts were compromised."