Anonymous is a hacker group that has coordinated cyberattacks on the Web sites of major corporations, like MasterCard, and the government, including the United States Department of Justice. In 2010, it attacked sites of corporations it considered hostile to WikiLeaks and its founder, Julian Assange, and made some Web sites inoperable or slow. It also has been campaigning against the Westboro Baptist Church, most recently because church members had threatened to picket a vigil for the victims of the Newtown, Conn., school shootings.

The hackers’ crusade against the Big Red football team on Sunday ignited activity on the Web about the rape case. The video that Anonymous posted on the team’s Web site was removed from the site Monday morning.

A statement from the Steubenville City Schools said the school system does not own or control the hacked Web site, Rollredroll.com, nor does it have any connection with it.

“We will continue to monitor our Web sites for any inappropriate content,” the statement said.

The unauthorized video posted on the team’s Web site referred to the case of a 16-year-old girl who prosecutors said was raped on the night of Aug. 11 at a series of parties in and around Steubenville. Twitter comments, a photograph on Instagram and at least one video that was posted on YouTube that night documented the rape, the police said. Twitter users wrote the words #rape and #drunkgirl, and some referred to the girl as “the dead body.” At least one Twitter comment suggested that the girl had been urinated on.

Trent Mays, 16, of Bloomingdale, Ohio, and Ma’lik Richmond, 16, of Steubenville — two sophomore standouts on the football team — remain on house arrest on charges that they raped the girl when she was too drunk to resist. Their trial has been set for Feb. 13 in juvenile court.