Washington DC: Comcast’s Internet service, Xfinity, was recently facing outages across the United States. Some reports state that other Internet service providers too have been facing problems.

A user-generated outage map on DownDetector.com showed that it was down in large cities like San Francisco, Los Angeles, Seattle and Boston.

Confirming the reports in a tweet on its customer care account, Comcast wrote, “Some customers are having issues with their XFINITY Internet service. We apologize & appreciate your patience while we work to fix.”

Later, Comcast revealed that this was an issue with an “external network,” and that they were still investigating.