Comcast customers across the US have been suffering from a serious lack of Internets and cable today thanks to a widespread outage beginning about 9AM EST. Customers in DC, Pennsylvania, Illinois, and Oregon seem to have been hit the hardest.
Comcast has confirmed the issues, although noted some may not be linked to the outage. It's also stated that its engineers have repaired the problem (what was repaired exactly isn't clear) and it should be mostly resolved. As of about 3PM EST, customers are still reporting trouble.