Five Long Island residents and a Bronx man who were allegedly behind a large-scale narcotics operation that stretched from the East End to the Bronx were arrested last week following a seven-month investigation, Suffolk District Attorney Ray Tierney and other law-enforcement officials said Friday.

Authorities who executed search warrants at homes in West Islip, Bay Shore, Wyandanch, Lindenhurst and the Bronx last week seized 4 kilograms of fentanyl during the investigation, Tierney said during a news conference in Brentwood, enough to kill every one of Suffolk’s 1.5 million residents. Investigators also found 5 kilograms of heroin, 1.8 kilograms of cocaine and 2,000 counterfeit, fentanyl-laced Oxycodone pills.

"The message here is simple, that if you deal in these deadly poisons and ope

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