Amazon Web Services suffered a major outage Tuesday, the company said, limiting service at many key and popular sites.

The company provides cloud computing services to many governments, universities and companies, including The Associated Press.

Amazon said in a post an hour after the outage began that it had identified the root cause and was “actively working towards recovery.” It did not disclose more about the cause.

The outage also affected Amazon’s ability to provide updates, it said.

The outage began midmorning on the U.S. East Coast, said Doug Madory, director of internet analysis at Kentik Inc, a network intelligence firm… “AWS is the biggest cloud provider and us-east-1 is their biggest data center, so any disruption there has big impacts to many popular websites and other internet service.