Toronto police have renewed their warnings about an illegal dangerous medical procedure designed to enhance the appearance of the person's buttocks.

The process, typically carried out in people's homes or in hotels, entails injecting the person with a substance described as a synthetic filler and can cost thousands of dollars, police said.

Some of the women have experienced serious medical complications requiring hospital treatment.

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Worse, long-term medical problems and even death can result when the procedure, dubbed Botox jabs, is performed outside a hospital, police say.

Last November, 46-year-old Marilyn Ely Reid of Newmarket, Ont., was charged with criminal negligence causing harm after allegedly giving the injections. The charge stemmed from the case of a Toronto woman aged 26 who was allegedly given several injections and required surgery to have the substance removed.

Further charges against Ms. Reid were laid in November.

Investigators have said she advertised buttock, lip and muscle augmentations on a Web site called pmmainjection.com., which currently depicts a black-magic theme, and describes itself as being for sale.

Monday's warning was issued after Toronto police concluded the practice is still continuing.

But was not immediately clear on what scale, or by whom, or whether additional charges are anticipated.