Staff and pupils were evacuated from a school's science block after a chemical incident.
Firefighters, police and paramedics were called to Westleigh High School on Wednesday due to vapours in a storeroom.
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The chemicals were removed by fire crews and put in a fume cupboard.
Staff and pupils had to be evacuated from the building, which is separate to the rest of the school, but no-one was hurt.
Emergency service crews remained at the school late on Wednesday afternoon and Wigan Council's health and safety team also attended.