4.2 million accounts were exposed as data was stolen during the authorization process. At least 1800 known cases of fraud occurred because of this breach. 165 stores in the Northeast, 106 Sweetbay stores in Florida and a smaller number of independent groceries that sell Hannaford products were affected by the theft.
source: Yahoo
[...] to glean credit card data from Hannaford Brothers. I posted back on the 18th of March about the Hannaford Bros. grocery stores breach but the new details have just recently emerged concerning how the intrusion was accomplished. [...]