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TORONTO — Police in Toronto are warning the public after several overdoses involving what could be contaminated street drugs.

They say a 27-year-old man overdosed and died on Thursday after using a substance suspected to be heroin that police believe may have been laced with fentanyl.

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Since that time, investigators say there has been another death and five additional overdoses in cases with similarities to the first fatal overdose.

They’re warning anyone coming into contact with a substance suspected to be heroin should exercise extreme caution.