A mosque in Amsterdam has been giving shelter to fundamentalist Muslims who went on to join Islamic State, the Telegraaf reported on Friday.
The paper bases its claim on a photograph which it says shows four 'heavyweights from extremist circles' plus one other man, said to be from the mosque organisation, in a room at the El Tawheed mosque in the west of Amsterdam.
Police sources have also backed up the story, the paper said.
Two of the men joined IS shortly after the photo was taken while the other two 'worked on explosives and a fire bomb'. One of the men, a Dutch Muslim convert, is also known to the police as a jihad recruiter, the paper said.