Hackers took over and defaced Comcast's Web portal for several hours overnight, leaving a cryptic message on the site that the company's 14.1 million subscribers use to access e-mail, news and technical support.
The front page of Comcast.net went down shortly before 11 p.m. ET Wednesday and was replaced with a note saying the hackers had "RoXed" Comcast, according to postings at BroadbandReports.com.
Comcast spokeswoman Jennifer Khoury said late Thursday morning that the hijacking had been reversed, but some users were still unable to access Comcast.net and Web-based e-mail.
There was no indication that e-mail or other private information was compromised by the attack, Comcast said.
The hackers appeared to have seized control of the Comcast.net domain name at registrar Network Solutions and redirected it to other servers, Khoury said.
"We have alerted law enforcement authorities and are working in conjunction with them," Khoury said.