Justice Secretary Chris Grayling has told the House of Commons he is to ask the Serious Fraud Office to investigate security firm G4S over the handling of its electronic monitoring contract after the company refused to take part in an additional forensic audit.
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According to local reports, the repairman had failed to disconnect the power to the escalator before getting to work.
Millwall fans who caused problems at the match against Barnsley could face lifetime bans, the club said.
Counter-terrorism forces, backed by Shi'ite militias on the ground and coalition airstrikes, are moving into the city on several fronts.