Police were called to a side street off Westgate in Wakefield city centre in the early hours of this morning after a 'concern for safety' report.
They found a "woman in distress" at the scene at 4.50am on Tuesday.
Enquiries are in the early stages and police are investigating whether a crime has taken place.
A police cordon remained in place at Thompsons Yard at this morning.
Anyone with any information is asked to call police on 101 quoting log 190 of 18/9