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The officer, identified Tuesday as Const. James Forcillo, claims to have ordered Mr. Yatim to stay on the streetcar and fired his weapon when the 18-year-old made a movement toward the doors, the source said.

Footage of Saturday’s fatal shooting, which appears to be a cellphone recording of a security camera monitor from the northwest corner of Dundas West and Bellwoods Avenue, shows Mr. Yatim clearly gesturing toward police with a knife in his hand. There is no audio but other videos have recorded someone saying, “You’re a pussy. You’re a f——- pussy”, while police yell “Drop the knife” repeatedly.

Mr. Yatim then backs off behind the driver’s well, toward the first row of seats.

Audio made available to the National Post from video taken from a different angle showed this to be the moment when a male police officer appears to say: “If you take one step in this direction with that foot …[inaudible] die.”

AUDIO OF THE WARNING: (Repeats five times)

Five seconds later, the teenager is shot for the first time. Video recordings suggest nine shots were fired.

The events are the subject of a probe by the Special Investigations Unit, which is in the process of interviewing 22 police officers believed to have witnessed the shooting.