Comcast said Friday it was restoring cable services after a widespread outage impacted customers across the U.S.

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The outage, triggered by cut fiber lines, brought down internet, television and phone service for Comcast XFINITY customers in markets including New York and Philadelphia. DownDetector.com, a website that follows outages, also tracked large outages in Chicago, Pittsburgh, Boston, Dallas, Denver and Seattle.

In a statement, Comcast said its engineers were restoring service to residential and business customers.

“We identified two, separate and unrelated fiber cuts to our network backbone providers,” the Philadelphia-based company said. “Our engineers worked to address the issue immediately and services are now being restored to business and residential internet, video and voice customers. We again apologize to anyone who was impacted.”

Comcast directed customers on Twitter to contact the company if they continued to experience service disruptions.