Philip Markoff is the Boston University med student who was arrested recently for allegedly murdering a 25 year-old masseuse he met via a Craigslist ad. He's also believed to have attacked another woman, robbing her at gunpoint. Now police have placed an ad of their own on the site asking people to come forward if they've also been victimized by Markoff.

Local police say they aren't sure if there are any other victims, but hope their posting will help figure that out.

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