The internet around the world has been slowed down in what security experts are describing as the biggest cyber-attack of its kind 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.
To do this, the group maintains a number of blocklists – a database of servers known to be being used for malicious purposes.
Recently, Spamhaus blocked servers maintained by Cyberbunker, a Dutch web host which states it will host anything with the exception of child pornography or terrorism-related material.
Sven Olaf Kamphuis, who claims to be a spokesman for Cyberbunker, said, in a message, that Spamhaus was abusing its position, and should not be allowed to decide “what goes and does not go on the internet”.
Spamhaus has alleged that Cyberbunker, in cooperation with “criminal gangs” from Eastern Europe and Russia, is behind the attack.
Cyberbunker has as yet offered no reply to the BBC when contacted directly.
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, but said he was unable to disclose more details as the forces in question 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.
In this case, Spamhaus’s Domain Name System (DNS) servers were targeted – the infrastructure that joins domain names, such as bbc.co.uk, the website’s numerical internet protocol address.
Mr Linford said the attack’s power would be strong enough to take down government internet infrastructure.
“If you aimed this at Downing Street they would be down instantly,” he said. “They would be completely off the internet.”
He added: “These attacks are peaking at 300 gb/s (gigabits per second).
“Normally when there are attacks against major banks, we’re talking about 50 gb/s.”
The knock-on effect is hurting internet services globally, said Prof Alan Woodward, a cybersecurity expert at the University of Surrey.
“If you imagine it as a motorway, attacks try and put enough traffic on there to clog up the on and off ramps,” he told the BBC.
“With this attack, there’s so much traffic it’s clogging up the motorway itself.”
Spamhaus is able to cope, the group says, as it has highly distributed infrastructure in a number of countries.
The group is supported by many of the world’s largest internet companies who rely on it to filter unwanted material.
Mr Linford told the BBC that several companies, such as Google, had made their resources available to help “absorb all of this traffic”.
The attacks typically happened in intermittent bursts of high activity.
“They are targeting every part of the internet infrastructure that they feel can be brought down,” Mr Linford said.
“We can’t be brought down.
“Spamhaus has more than 80 servers around the world. We’ve built the biggest DNS server around.”