Good news: it looks as if mosque members brought this to the attention of authorities. From the BBC, with thanks to Greg:
Police have launched an investigation into claims that video tapes and DVDs handed out at mosques in Dewsbury were being used to recruit terrorists.
The tapes, purporting to contain readings from the Koran, were given to Muslims attending two mosques in Savile Town during the weekend's Eid festival.
Local resident Safiq Patel said: "When people played them they realised they were violent jihad videos."
West Yorkshire Police confirmed they were studying one of the tapes.
Mr Patel told BBC News: "These tapes were left at points of public access in the reception areas of the mosques.
"People picked them up thinking they were prayers or readings from the Koran.
"They were shocked to find messages of jihad. It is someone trying to drum up violence, especially among the younger members of the community.
"Somebody is trying to infiltrate their consciences, decision-making and values in the hope of perhaps recruiting the terrorists of the future from this community."
A West Yorkshire Police spokeswoman said: "Members of the local Asian community have brought to our attention these matters.
"On Tuesday we received a copy of the video which is being looked at to establish whether it contains material which would incite violence, racial hatred or acts of terrorism."