From the Boston Globe:

"With help from US Secret Service agents, Stop & Shop Supermarket Cos. executives scrambled yesterday to determine how many consumers may have had their credit and debit card data stolen by high-tech thieves who apparently broke into checkout-line card readers and planted the equivalent of bugs to steal information."

Stop and Shop stores with confirmed tampering:
Seekonk and in Bristol, Providence, and Warwick, R.I.

Anyone who shops at Stop and Shop should check their statements for fraudulent charges and report any they find. —MEGHANN MARCO

Stop & Shop reports credit data was stolen [Boston Globe] (Thanks, Lawrence!)