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The teacher, who uses the name Miss McIntosh on the microblogging site, said she and her colleagues locked the door to the staff room and contacted the RSPCA for help.
McIntosh said the building's alarms hadn't been triggered, so teachers theorized the animal might have come in when support workers unlocked the school in the early morning.
The teacher said RSPCA rescuers arrived quickly and took the fox away to be examined by veterinarians.