Nearly a year after a man was injured in a shooting, the Special Investigations Unit has determined there aren’t any reasonable grounds to lay criminal charges against a Toronto police officer.

An 18-year-old man was shot on April 7 at about 6 a.m. after Toronto police executed a search warrant at an Etobicoke apartment at 235 Sherway Gardens Rd., near the QEW and The West Mall.

They were searching for a firearm in connection with a school shooting earlier that week, the SIU report released Tuesday said.

There was an “interaction” between the officers and the man after police entered a fifth-floor unit. The man was shot in the arm, and taken to hospital.

SIU director Joseph Martino said there was no basis to proceed with criminal charges against the officer.

Martino said he believed the shooting was inadvertent and the investigation was over whether there was careless use of a firearm.

Due to the “complainant’s lawful arrest, the possibility of an illicit firearm, a struggle of some nature and extent — I am unable to reasonably conclude that the (officer’s) firearm discharged inadvertently because of a marked lack of care on the part of the officer,” Martino said in the decision.

The man was charged with attempted murder in connection with the school shooting.

The SIU is an arm’s-length agency that investigates reports relating to police where there is a death, serious injury or sexual assault.

Raneem Alozzi is a breaking news reporter, working out of the Star's radio room in Toronto. Follow her on Twitter: @r_alozzi

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