Large parts of Trafford Park in Manchester have been cordoned off by police after a chemical leak at an industrial estate this evening.
Police have urged residents in the area to stay indoors and to keep windows closed.
Manchester Fire and Rescue services described it as a "major" incident but emergency crews said no one is thought to have been injured.
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Clocks will go forward 30 minutes so there is half an hour more daylight in the evening when energy consumption peaks.