A spokesperson for Crossrail has told ITV London that the worker who has died was spraying concrete when a piece of concrete from the ceiling fell and hit him.
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Rahman was ejected from his powerful job in April by an Election Commissioner after being accused of corrupt and illegal practices.
The service was due to start in September but there is no agreement on pay and conditions such as how many night shifts staff will work.
Would you know what to do if you needed help? Here's the official advice from the Foreign Office.