It was not immediately clear what they were responding to.
"Police are responding to a call at a college in Trafford," Greater Manchester Police said in a statement. "Officers are in attendance and we are currently assessing the situation."
Trafford is a borough of Greater Manchester to the south of the city centre.
(Reporting by Kate Holton and Paul Sandle; writing by Alistair Smout; editing by Guy Faulconbridge)
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