POLICE are investigating alleged assaults by both a teacher and a pupil at Queensmead School in South Ruislip.
A 15-year-old pupil initially complained to police that a teacher had assaulted him during a lunch break.
A counter-allegation was then made by the teacher that he had been assaulted by the pupil.
A Hillingdon police spokeswoman said: "On January 26 police received a report of an assault on a 15-year-old by a teacher at Queensmead School.
"On January 26 police received a report of an assault on a school teacher by a 15-year-old boy at Queensmead School.
"Hillingdon Police are investigating both reports."
Queensmead School has refused to comment.