'Sabotage' crash claim rejected
	Suggestions of sabotage by an "informed person" were put forward by Jarvis, the firm responsible for track maintenance at the scene of the crash. The BBC's Rory Cellan-Jones reports.

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	Non-executive director of Jarvis and former Conservative transport minister Steven Norris: "Some tampering has been going on"
	Rail expert Christian Wolmar on the sabotage theory: "I think it's largely a smokescreen"