The London Police Service has issued a warning to the city's sex workers after a woman was allegedly tied up, tasered, assaulted and had her car stolen by a 37-year-old man she met through an online ad.

Police have issued a warrant for the arrest of Omar Oneil Williams. (London Police Service)

Police said the woman met the man on April 15 and received minor injuries as a result of the incident, though she did not seek medical treatment.

A warrant has been issued for the arrest of 37-year-old Omar Oneil Williams on charges of robbery, forcible confinement, assault with a weapon, assault and possession of a prohibited weapon.

The suspect is described as a black man, about 5'8 and 200 lbs, between 25 and 40-years-old. He has short hair, is clean shaven and was wearing a black and grey toque and a black hooded sweatshirt at the time of the alleged incident.

Officers note Williams' current whereabouts are unknown, though it's believed he may be in the Greater Toronto Area.

London police began notifying sex workers of potentially dangerous customers in 2018. It followed the killing of Josie Glenn, a London woman who worked in the sex trade.