The attack on PSN come after warnings from the Anonymous group threatening as much. Sony CEO Howard Stringer said he didn’t think there was any lack of vigilance, though he said he wasn’t aware of the threats.

“Obviously our network security didn’t stop the attack and we’re trying to understand why, and we’ve made big strides in bolstering our security,” he said, noting his belief that Sony had, “good, robust security.

Stringer noted that with a lack of a pay-in system, he felt like theft of passwords and other personal data appeared less likely. “We have a network that gave people services free, said Stringer. It didn’t seem like the likeliest place for an attack.”

Source: Bloomberg