An undercover journalist has reportedly planted a fake bomb on a train carrying a cargo of nuclear waste.
An investigation has begun after the newspaper report claims a journalist wandered up to unattended train wagons and planted the "device" at a north west London depot.
The report says a terrorist could have blown up the waste, which would have sparked a vast toxic cloud with possibly deadly consequences.
The train travels from Kent to Cumbria carries radioactive flasks of spent uranium fuel rods.
The journalist approached the train as it sat in sidings at the depot.
Posing as a rail worker he approached the wagons after they were left seemingly unattended for almost 10 minutes.
The yard is just a short walk from a sports stadium, a large hospital and one of the capital's major roads, and is surrounded by housing estates, according to the report.
The reporter says his only identification as a legitimate rail worker was a fluorescent orange jacket and hard hat, both readily available to the public.
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There will certainly be a lot of Red Faces there, and no doubt, as so they should, some Senior Management heads will roll