A number of big websites in the US and Europe are being hit by what appears to be a large cyber attack.

It's been disrupting sites including Twitter and Netflix, as well as Spotify, Airbnb and Reddit.

Services including PlayStation Network have also been hit.

The first problems appeared on the East Coast of the United States but people in Europe are now reporting outages too.

No one has claimed responsibility, but US government officials say they're looking at all possible scenarios.