Gang members charged after week of heroin overdoses

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CHICAGO -- Two gang members are charged with selling heroin to an undercover Chicago police officer.

Alfonzo Sylvester and Mario Wofford are charged with possession with intent to deliver; Sylvester is also charged with trying to run away from the police.

The arrests came after a week in which 74 people on the West Side overdosed on heroin in a 3-day period.

The drug may be laced with the painkiller fentanyl; police still haven't traced the source of the heroin.