Police have cordoned off part of Hustlergate in Bradford following a report of a sexual assault.
A police cordon is in place outside Waterstones at the Wool Exchange and an officer is guarding the scene.
The incident took place during the early hours of Friday morning in the Bank Street area of the city centre.
A female came forward to police after experiencing a sexual assault.
Anyone who has any information which could assist the police is asked to contact Bradford District CID on 101 or via the website at westyorkshire.police.uk/101livechat Information can also be given anonymously to the independent Crimestoppers charity on 0800 555 111.
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