The Federal Interior Ministry in Germany has banned a website which it calls the most influential militant left internet platform.
It is thought that this decision was taken as a result of violence breaking out during the G20 summit last month, according to The Local.
The website, linksunten.indymedia.org, was told today (August 25) that it would be closed, according to ministry sources.
It is claimed by security sources that the website is used by violent extremists as a forum.
Spiegel reported that the ministry said the site “goes directly against the law in both its aims and actions."
On the website users were able to post anonymously and this has led to the militant left posting about responsibility for crime.
It is claimed that people using the website called for violent action during the G20 summit in Hamburg and security sources claim it therefore played a large role during the violence which took place.
During the protests cars were burned, shops were broken into and windows were smashed. 500 police officers were also hurt.
Properties linked to the managers of the website have also been searched by police in Freiburg, Baden-Württemberg.
No arrests have been made, however evidence and computers have been seized for the investigation.