Reveal video showing police firing 16 times Chicago a young black

The incident occurred on October 20, 2014, when the police officer Jason Van Dyke shot 16 times McDonald amid an operation on a bridge in Chicago.
At the time of the incident, police said the 17-year-old had refused to hand over a knife in his hand.
However, Van Dyke was charged with first-degree murder and the situation has since generated a climate of growing racial tensions in the US city.
The mayor, Rahm Emanuel, made on Tuesday called for calm after the pictures, in which the time when young is intercepted by authorities and later when he was hit by bullets shown to meet.
JasonImage copyrightReuters
Image caption
Jason Van Dyke is the police officer accused of shooting the young.
"Okay react, but it is essential to remain calm," Emanuel said.
However, hundreds of people took to the streets after broadcasting the video was given.
During the march, which took place peacefully, protesters shouted constamente "16 shots".
Excessive use of force against African Americans has been the object of protests around the country in recent months.
Several shots from behind
During the autopsy that was performed to McDonald he was found that two of the bullets that killed him was made in the back.
Attorney Anita Alvarez said Van Dyke had no justification to fire the young.