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A Niagara Regional Police officer is in critical condition in a Hamilton hospital after being shot by a fellow police officer on Thursday, according to CBC News.

Monica Hudon—spokesperson for Ontario's Special Investigations Unit—reportedly said, "I can only tell you that there was an altercation, a firearm was discharged and one officer was struck."

"As the SIU is involved we are prohibited from providing further information at this time," Special Investigations Unit said in a statement.