The EU is serious about closing down Internet sites that teach users how to build bombs and will ask member states to ratify proposals during anti-terrorism talks in November. 

Other anti-terrorism measuers to be proposed will include making the private data of airline passengers available, and automated warnings to police forces when explosives are stolen.
There have been a number of cases around the world where bombs, crafted from instructions found on the Internet, have been detonated.
A spot-check on Internet search engines reveals that bomb-making instructions are readily available and accessible to anyone.