Sony is still investigating the security breach that downed its PlayStation Network and Qriocity online services, but expects the gaming network will be back in operation this week, a company exec told media Sunday afternoon in Tokyo.

Full service on PlayStation Network to resume this week with online gaming, full service expected to be restored by mid-May, Executive Deputy President Kazuo Hirai told media at a briefing that ended just minutes ago.

Sony will welcome back its users with free downloads of selected software, the company said.

What Sony called a "criminal cyber attack" centered on the data center in San Diego, Hirai told reporters. The company still has no evidence of theft of credit card data that customers entered to pay for PSN services, but cannot rule out the possibility.

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