London Underground says that up to 5,000 people are at work under London's streets every night to work on maintaining the tube network. These essential works mean that the tube cannot run 24 hours a day.
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The killer's solicitor has written to police challenging them to prove his confession.
Tottenham last won the league back in 1961 - but they are feeling confident after a string of great performances this year so far.
Crimestoppers are offering the reward as police say they are becoming increasingly concerned at the viciousness of the assaults.