A major internet outage has affected the websites of major retail, financial, logistics  and travel websites, and appears to be affecting 911 services in several areas.

Down Detector, a service that detects whether websites are working properly or not, began reporting a series of at least 50 major website outages shortly before 12 pm EST on Thursday.

Among the affected websites were Costco, Airbnb US Bank, UPS, Fox News, American Airlines, Delta Airlines, AT&T, Groupon, Expedia and TikTok, according to Down Detector.

The filings page of the US Secruities and Exchange Commission also displayed a message saying that it was ‘temporarily unavailable’.

In addition to the aforementioned websites, a number of global financial institutions are being impacted, including Interactive Brokers, Santander Bank, BBVA and BB&T.

Down Detector tweeted that Amazon Web Services and Oracle Cloud are also having problems, but a look on Amazon Web Services’ website shows its operations appear to be working normally.

Other websites that are being impacted include Microsoft, Evernote, Go Daddy, Vanguard and a number of other tech or financial-centric domains.

Meanwhile, at least nine counties and three cities in Virginia reported 911 outages or call issues on Thursday.