Take-Two Interactive Software Inc. said hackers broke into the networks of its Rockstar Games Inc. unit and illegally accessed early-development footage of the company’s next “Grand Theft Auto” videogame.

Take-Two disclosed the hack in a securities filing Monday, saying that an unauthorized third party downloaded confidential information from its systems. The New York-based company said that Rockstar Games doesn’t expect any long-term disruptions from the incident and that work on the widely known game will continue as planned.