Chemical Attack on London Underground.

[David]

Don't worry, it's only a test.....

The government is to carry out tests to see how toxic substances would spread if used by terrorists on the Tube.
A harmless chemical - sulphur hexafluoride - will be used to monitor airflows at north-west London's St John's Wood London Underground station.

Services will run as normal on the two Sundays chosen for the tests, 25 March and 1 April.

Scientists from the Ministry of Defence will be in charge of the tests, which they say pose no safety risks.

http://news.bbc.co.uk/1/hi/england/london/6454075.stm

Bet I had a few people worried there....