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| Version 1 | Version 2 |
|---|---|
| 'Poison gas' test on Underground | 'Poison gas' test on Underground |
| (about 11 hours later) | |
| Tests have been held to see how toxic gas would spread if it was used by terrorists on London's Tube. | |
| The trial took place at St John's Wood station on the Jubilee line, which operated as normal. | |
| Harmless sulphur hexafluoride was released and then equipment checked as the gas drifted around the building. | Harmless sulphur hexafluoride was released and then equipment checked as the gas drifted around the building. |
| The one-day trial will be repeated next Sunday. The results will be analysed by scientists at a Ministry of Defence laboratory. | The one-day trial will be repeated next Sunday. The results will be analysed by scientists at a Ministry of Defence laboratory. |
| The release of sarin gas in the Tokyo subway system in 1995 killed 12 people and injured nearly 6,000 others. | |
| The St John's Wood trials were announced earlier this month by Transport Secretary Douglas Alexander who stressed the tests were not a reaction to any threat increase or a measure to enhance security at Tube stations. | The St John's Wood trials were announced earlier this month by Transport Secretary Douglas Alexander who stressed the tests were not a reaction to any threat increase or a measure to enhance security at Tube stations. |
| The experiment follows trials of passenger screening technology at Paddington station in west London in January last year. | The experiment follows trials of passenger screening technology at Paddington station in west London in January last year. |
| There were further trials at Canary Wharf and Greenford Tube stations. | There were further trials at Canary Wharf and Greenford Tube stations. |
| Trials also took place last August to test the practicalities of deploying portable vehicle access control barriers at major entry points at Waterloo and Victoria stations in London. | Trials also took place last August to test the practicalities of deploying portable vehicle access control barriers at major entry points at Waterloo and Victoria stations in London. |