An upsetting new Sammy Yatim video shows the 18-year-old's final moments after he was shot by police on an empty Toronto streetcar early Saturday morning.

The "first on scene" video was posted to YouTube Saturday, but has only received attention over the last 24 hours. The footage shows the aftermath at the crime scene, with police milling about while CPR is performed on Yatim.

You can hear an officer or paramedic loudly counting as he tries to resuscitate Yatim.

Shell casings are kicked around by officers as bystanders freely roam the scene of the shooting. The Toronto Sun has pointed out a number of instances in the video that could be viewed as contamination of the scene.

The most disturbing moment comes around the 2:37 mark when the videographer walks to a new position to point his camera at the streetcar door. Yatim's legs are clearly visible and he appears to go through spasms.

Around the same point, an officer can be heard shouting: “Where’s Forcillo? Hey, find me Forcillo. Where's Forcillo?”

James Forcillo was identified Tuesday by various news organizations as the officer suspended with pay in relationship to the shooting.

Soon after the leg twitches, an office or paramedic says "multiple shots, no pulse."

Other video from a security camera near the crime scene which emerged Tuesday also shows Yatim's last minutes, as well as passengers exiting the streetcar. Yatim falls down after being shot in that footage.

A witness who was on the streetcar told CBC Yatim pulled a knife and told the passengers to stay on board. They didn't listen and the witness, Aaron Li-Hill, used his bicycle to block Yatim from getting at the other passengers before exiting the streetcar himself. Li-Hill said Yatim never pointed the knife at him, keeping it facing upward.

Other reports have indicated Yatim exposed himself on the train around the time he pulled the knife.

Various videos of the shooting on the empty streetcar have prompted outrage, public protest and questions about how police should react when a suspect with a weapon is surrounded.

Ontario's Special Investigations Unit is probing the shooting and Toronto Police Chief Bill Blair has said his office will also conduct a review.

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  • Sammy Yatim Protest, Vigil

    A crowd marches on Dundas Street in Toronto on Monday, July 29, 2013 where Sammy Yatim, 18, was shot nine times and killed by police early Saturday morning in Toronto. THE CANADIAN PRESS/Michelle Siu

  • A man screams at officers at Toronto Police 14 division as a vigil turns into a protest on Monday, July 29, 2013 for Sammy Yatim, 18, who was shot nine times and killed by police early Saturday morning in Toronto.

  • A man confronts officers at Toronto Police 14 division as a vigil turns into a protest on Monday, July 29, 2013 for Sammy Yatim, 18, who was shot nine times and killed by Police early Saturday morning. THE CANADIAN PRESS/Michelle Siu

  • Sammy Yatim Protest, Vigil

    A person protests at Toronto Police 14 division as a vigil turns into a protest on Monday, July 29, 2013 for Sammy Yatim, 18, who was shot nine times and killed by police early Saturday morning in Toronto. THE CANADIAN PRESS/Michelle Siu

  • Sammy Yatim Protest, Vigil

    A person chants "Justice for Sammy" at a vigil on Monday, July 29, 2013 at Dundas Street and Bellwoods Avenue where Sammy Yatim, 18, was shot nine times and killed by Police early Saturday in Torontomorning when he was alone with a knife on a street car. THE CANADIAN PRESS/Michelle Siu

  • A man shouts at officers at Toronto Police 14 division as a vigil turns into a protest on Monday, July 29, 2013 for Sammy Yatim, 18, who was shot nine times and killed by police early Saturday morning in Toronto.

  • Sammy Yatim Protest, Vigil

    Mother Sahar Bahadi is comforted as she sits next to sister Sarah Yatim at a vigil on Monday, July 29, 2013 at the spot where son and brother Sammy Yatim was shot nine times and killed by Police early Saturday morning in Toronto. THE CANADIAN PRESS/Michelle Siu

  • Sammy Yatim Protest, Vigil

    Mother Sahar Bahadi breaks down at a vigil on Monday, July 29, 2013 at the spot where her son Sammy Yatim, 18, was shot nine times and killed by Toronto Police early Saturday morning when he was alone with a knife on a street car. THE CANADIAN PRESS/Michelle Siu

  • Sarah Yatim breaks down in the arms of her mother Sahar Bahadi at a vigil on Monday, July 29, 2013 at the spot where her brother Sammy Yatim, 18, was shot nine times and killed by Toronto Police early Saturday morning when he was alone with a knife on a street car.

  • Sammy Yatim Protest, Vigil

    Mother Sahar Bahadi, right, is comforted by her daughter Sarah Yatim, left, as they march on Monday, July 29, 2013 to the spot where their son and brother Sammy Yatim was killed by police early Saturday morning in Toronto. THE CANADIAN PRESS/Michelle Siu

  • A shirt with Sammy Yatim's picture is worn by a supporter at a vigil on Monday, July 29, 2013 in Toronto at the spot where the boy, 18, was shot nine times and killed by Police early Saturday morning in Toronto.

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