An 18-year-old woman was allegedly sexually assaulted outside Morley Academy in the early hours of this morning.
Police have arrested a 25-year-old local man in connection with the incident, which took place opposite the entrance to the school, on Fountain Street, at 3.30am.
They believe another man saw the attack and disturbed it, allowing the woman to escape.
And police want to trace the man.
Det Supt Mark Ridley, of the Homicide and Major Enquiry Team, said: “We have made an arrest in connection with this assault and are conducting enquiries.
“We are keen to trace a man described as having dark hair and wearing glasses who potentially saw and disturbed the assault and I would urge him to come forwards to speak to us as a potential witness.”
Anyone who has information is asked to contact the Homicide and Major Enquiry Team on 101 or CrimeStoppers, anonymously, on 0800 555 111.