The internet around the world has been slowed down in what security experts are describing as the biggest cyber-attack in history.
A row between a spam-fighting group and hosting firm has sparked retaliation attacks flooding core infrastructure.
It is having an impact on widely used services like Netflix – and experts worry it could escalate to affect banking and email services.
Five national cyber-police-forces are investigating the attacks.
Spamhaus, a group based in both London and Geneva, is a non-profit organisation which aims to help email providers filter out spam and other unwanted content. read