Comcast is dealing with a widespread failure of some of its services on Friday.
The Philadelphia company told CNBC that it understands a nationwide outage of some Internet, video and voice customers and is working to restore the service.
The company's Twitter support account made a statement: "One of Comcast's big backbone network partners had a fiber-optic cut. This also affects other vendors."
Comcast's verified Twitter account has some users who complain about a lack of service. The replies were said to restore the service and direct users to the Xfinity status updates service site. It was the second Comcast outage in the last few weeks. In early June, Comcast's telephone service was lost to some US companies.
Comcast is one of the nation's largest operators of cable television and home internet services.