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CHICAGO — Chicago police are investigating after video of an officer kicking a suspect in the head was posted online.

A department spokesman tells WGN Superintendent Eddie Johnson has seen the video and has ordered an investigation.

Around 3:15 p.m. on the city’s West Side, an official unknown plainclothes officer is seen on the video struggling to handcuff a suspect.

Family identified the suspect as 24-year-old Shaquille O’Neal who appears  to be resisting arrest.

Moments later, a second plain clothes officer arrives and calls for backup.

As O’Neal continues to resist, the second officer then kicks him in the head.

At that point it appears, O’Neal is unconscious. He is cuffed and uniformed backup arrives.

O’Neal lies still unassisted until paramedics arrive several minutes later.

Police News affairs issued a statement to WGN saying:

The Chicago Police Department holds its members to the highest possible professional standards with a priority on treating all Chicagoans with respect.  Upon viewing the video, Superintendent Johnson immediately asked the Independent Police Review Authority to investigate the matter while the department gathers more information about the case.