Sony said Saturday it would hold a weekend press briefing to explain the breach at its online game network that compromised the personal information of millions of users and forced the company to shut down the service for the past 10 days.

Sony's Executive Deputy President Kazuo Hirai will speak at 2:00 p.m. Japan time (09:00 a.m. ET) about the breach, as well as the firm's information management system and the schedule to resume services, Sony said in a news release on Saturday.

Sony has said that a hacker penetrated the security of its PlayStation Network earlier this month and gained access to the names, birth dates and possibly credit-card information for the 77 million registered accounts on the service.

The briefing will come a few days after two U.S. Congress members asked Hirai to explain when it first learned of the breach, why the company waited days to notify its customers and how it intends to prevent future incidents.

The firm, which shut down the network on April 19, could face legal actions after it delayed disclosing the security breach information.