Internet users across the northeast U.S. experienced widespread outages for several hours Tuesday, interrupting work and school because of an unspecified Verizon network issue.

“An internet issue impacting the quality of our Fios service throughout the Northeast has been resolved,” said spokesman Rich Young in an emailed statement Tuesday afternoon. He said service levels “are returning to normal” and the company is investigating what happened. The service interruptions were unrelated to a cut fiber in Brooklyn, New York, which caused problems for people in the area.

There are about 6.5 million Fios internet customers.

Downdetector, which tracks internet troubles, has been posting alerts and updates about outages all day with some troubles being cited as early as Monday night. Zoom has been affected as Microsoft Teams.

Most outages began around 11:30 a.m. Nearly 30 were reported throughout the morning. And numerous more companies joined the list later.

Among those companies being hit were Bandwidth, which is based in Raleigh, and Epic Games, publisher of Fortnite.

The outage affected internet and cloud providers as well as major sites such as Google and Facebook. Amazon, whose web services division powers a wide ranges of online services, indicated its network wasn’t the cause of the problem and that connectivity issues for its Amazon Web Services customers were resolved around 12:45 p.m., after an hour and a half. Google said it also had not found issues with its own services and was investigating.

For updates, check out Downdetecor’s Twitter feed.

Big internet outage strikes US, hitting wide variety of services, companies, then eases