Two U.S. Congress members are asking Sony Corp. to explain its handling of the recently disclosed data breach involving its PlayStation Network, one of the largest data thefts ever.

On Friday, Rep. Mary Bono Mack (R., Calif.) and Rep. G.K. Butterfield (D., N.C.), members of a Congressional subcommittee on commerce, manufacturing and trade, asked Kazuo Hirai, the head of Sony's videogames division, to address their concerns. The letter asked when Sony first learned of the recent breach, why it waited days to notify its customers, and how Sony intends to prevent further breaches in the future.

A spokesman for Sony didn't respond to a request for comment on the letter.

Sony has said the breach occurred earlier this month and resulted in the loss of names, addresses and possibly credit card numbers associated with 77 million accounts on its online game network. While Sony and law enforcement officials haven't addressed whether they have any suspects in the intrusion, one prominent target of a past Sony legal attack over a hacking incident denied any involvement in the data theft.

On his personal blog, George Hotz, a programmer who was sued by Sony in January after cracking the PlayStation 3 videogame console to let it run homemade software, said: "to anyone who thinks I was involved in any way with this, I'm not crazy, and would prefer to not have the FBI knocking on my door."