Lulzsec Rogue suspected of Mt. Gox Hack
guardian.co.uk
guardian.co.uk
"..However, Amir Taaki, who runs the rival Bitcoin exchange Britcoin.co.uk, disputes this chain of events. Developers working on his site, which runs on much of the same software as MtGox, found a security hole several days before the hack was carried out. He says MtGox was notified publicly and privately of the issue. .."