Officers were called to Richmond Road, Horsham, at around 4.30pm after a 17-year-old girl was attacked outside The College of Richard Collyer.
Police said the girl’s handbag was stolen by a suspect, believed to be a man, who made off towards Horsham station.
Officers stopped a train at round 4.40pm to search for the man. He was not located and enquires continue.
On Twitter Shane Hudson said: “On way to London, stuck in Horsham. Police all over train looking for a suspect.”
All lines travelling through Horsham were blocked due to the incident.
Southern Rail said they have now been re-opened.
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