During the London 2012 Olympic Games from July 27-30 British Transport Police has said that they have received over 70 reports of passenger property theft (excluding this morning).
The special police force added that passenger property theft was the most-reported railway crime during this period, from 178 crime incidents.
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The world's first ever 'hole in the wall' was installed in Enfield, north London, on June 27 1967.
America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.