A batch of bad heroin that has killed one person in Chicago and sickened 24 others is believed to be in the Illinois Valley, according to local drug task force authorities.

Chicago police officials called together top police and drug enforcement officials Thursday to share information on a string of heroin overdoses that took place Wednesday and to try to track the toxic drug to its source.

Authorities believe the overdoses were caused by tainted heroin that was being given out for free.

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