Metropolitan Police officers are investigating an alleged sexual assault in Chiswick on Tuesday (October 24).
According to a spokesman for the force, the assault reportedly took place between 8.30pm and 9.30pm in Chiswick High Road.
An eyewitness said they saw a police cordon in the alley between Le Pain and Kitchen and Pantry.
As of 12.11pm on Wednesday (October 25), a crime scene was still in place.
No arrests have been made in relation to the "possible sexual assault", a Metropolitan Police spokesman said.
Enquiries by Hounslow MPS are ongoing.
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