From BBC

Spamhaus, a nonprofit spam filtering organization, has been targeted by a cyber attack.

Steve Linford, chief executive for Spamhaus, told the BBC the scale of the attack was unprecedented. "We've been under this cyber-attack for well over a week.

"But we're up - they haven't been able to knock us down. Our engineers are doing an immense job in keeping it up - this sort of attack would take down pretty much anything else."

Mr Linford told the BBC that the attack was being investigated by five different national cyber-police-forces around the world.

He claimed he was unable to disclose more details because the forces were concerned that they too may suffer attacks on their own infrastructure.

The attackers have used a tactic known as Distributed Denial of Service (DDoS), which floods the intended target with large amounts of traffic in an attempt to render it unreachable.