The websites of several leading companies, including HSBC, Airbnb and British Airways, appear to have been hit by outages.
A message on BA’s website read: “Service Unavailable – DNS Failed. The server is temporarily unable to respond to your request. Please try again later. “
And a post on the Airbnb site said, “This site cannot be reached.”
HSBC’s website had a similar message.
It is not known what caused the problems.
And there are reports that other airlines and large businesses are also affected, as well as 911 service on the east coast of the United States.