Two men are in custody after the thefts of cell phones from two people who advertised on Kijiji.
Police say one man met two men in a vehicle on Gallantry Way in Stittsville last night, and passed the phone into the car for inspection.
The vehicle sped off, dragging the victim for a short distance.
He suffered minor injuries.
Less than an hour later, another man was assaulted by the passenger of a car that had arrived on Crestway Drive to see his cell phone.
The victim sustained minor knife wounds.
Two suspects were arrested a short time later.
Muhammad Naeem of Gatineau and Edwin Edouard of Ottawa are facing several charges, including robbery and possesion of an offensive weapon.
Police advise that those using the web to sell goods that they should choose their own meeting spot, and make it a very public place.