It's not your TV. It's not your laptop. It's Comcast.

The company, one of the nation's largest operators of cable TV and residential internet services, said Friday afternoon it is dealing with a widespread outage.

The Philadelphia company told CNBC, which it owns, that it is aware of a nationwide outage affecting some of its internet, video and voice customers and is working to restore service.

The company said one of it large backbone network partners experienced a fiber cable failure that it believed was impacting other providers. The outage began about 1 p.m. Friday.

Comcast's verified Twitter account replied to some users complaining about a lack of service. In the replies it said it was working to restore service and pointed users to the Xfinity service site for status updates. It was the second Comcast outage in the past few weeks. Earlier in June, Comcast's phone service for some U.S. businesses went down.

"It's currently affecting our business & residential internet, video & voice customers. We apologize and are working to get services restored as soon as possible," a company spokesman said.