"Safety is our top priority and the cause of this incident is being investigated. We apologise to customers for the inconvenience caused by the power cut and our staff restored all supplies as quickly and safely as possible."
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She escaped serious injury but Collins said she had been left with bruising and in pain and was in "total shock" after the fall.
Perkins said Weinstein repeatedly sexually harassed her, starting when he asked her to massage him while he was in his underwear.
The drivers have rejected two previous attempts to reach an agreement.