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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.

Hello. We are aware and working to restore services as quickly as possible. We apologize for the inconvenience. -ZL — ComcastCares (@comcastcares) June 29, 2018

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.

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. We apologize and are working to get services restored as soon as possible. -Sami — Comcast (@comcast) June 29, 2018

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Comcast said most of its services had been restored.

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

Nationwide Comcast outage ongoing. Most affected markets seem to be Atlanta, Chicago, Minnesota, Washington state. DC to NY corridor unaffected. — PreferToRemain Anonymous (@PreferToRemain) June 29, 2018

Current LIVE nationwide outages, wow: pic.twitter.com/MUQaxayy4G — Ricky Davila (@TheRickyDavila) June 29, 2018

BREAKING: Major nationwide outage for #Comcast. Appears primarily centered around cable service although some are reporting ain’t connectivity issues. Are you down? — Ed Oswald (@edoswald) June 29, 2018

I’ve tried calling Comcast and using my Xfinity app. Phone msg says all lines are busy. #comcastoutage — The Resistance 🏳️‍🌈📎🌊🌊🌊 (@dc_man19xx) June 29, 2018

Comcast nationwide outage is the worst Friday timing ever — Dan Parzych (@DanParzych) June 29, 2018

So apparently this Comcast internet outage is nationwide so. Fun. — Emily (@Lemily22) June 29, 2018

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