Police have launched an investigation after two women reported feeling threatened by a male taxi driver who made "alarming" comments.
Avon and Somerset Police say they believe they have identified the relevant driver and "urgent enquiries" are ongoing.
It comes as police say they are aware of a post on social media concerning a similar incident in which a woman was allegedly falsely imprisoned by a taxi driver in Bristol.
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Police are urging the victim of the unreported incident to come forward as investigations continue.
A spokesperson for the force said: "We’re aware of a post on social media concerning an incident in which a woman was allegedly threatened and falsely imprisoned by a taxi driver in Bristol.
"At present, the victim is unidentified and enquiries are ongoing to establish their identity. We’d ask them to make contact with police by calling 101, quoting reference 5222012159."
The statement continued: "Police are investigating two connected reports which have been made in recent days.
"In both incidents, female passengers have reported feeling threatened by a male taxi driver who made comments of an inappropriate and alarming nature. Both women were unharmed.
"Police believe they have identified the relevant driver and urgent enquiries are ongoing to progress the investigation."
A post seen by Bristol Live was widely shared on social media over the weekend with concerning details about what was reported to have happened in one of the taxis.
Police have not given any further details about the nature of the allegations.
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