ROUGH CUT (NO REPORTER NARRATION)br br A top official with retailer Target Corp. apologized to a U.S. Congressional panel on Tuesday (February 4) for the massive data breach that compromised payment card data and personal information of tens of millions of its customers.br br John Mulligan, chief financial officer at Target, appeared before a Senate Judiciary Committee hearing on preventing data breaches and combating cybercrime.br br "I want to say how deeply sorry we are for the impact this incident has had on our guests - your constituents," Mulligan said.br br The No. 3 U.S. retailer is working hard to earn back the trust of its customers and "moving as quickly as possible to share accurate and actionable information with the public," he said.br br Target was hit by a massive cyber theft over the holiday shopping period.