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PHILADELPHIA (CBS/AP) — A major outage affected Comcast customers nationwide, including in the Philadelphia market, on Friday.

The outage affected Comcast cable, telephone and internet services.

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Comcast tweeted to customers that they are working to restore services as quickly as possible.

Comcast tweeted that a cut fiber is causing the outage.

“One of our large backbone network partners had a fiber cut that we believe is also impacting other providers. It’s currently affecting our business & residential internet, video & voice customers,” Comcast said.

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Comcast said most of its services had been restored.

Many people took to Twitter to sound off about the outage.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)