Undercover narcotics detectives made four arrests Wednesday as part of a heroin crackdown in Elmont that included the discovery of a makeshift "heroin mill," police said.

The undercover cops from the county's Narcotics/Vice Bureau made two separate drug busts Tuesday night, as part of the department's Long Island Heroin Initiative. In one of the busts, police found what they called the "heroin mill" in the basement of an Elmont home, and also found Methadone tablets and cocaine, officials said.

Police said officers recovered scales, cutting agents, empty glassine envelopes, rubber bands, spoons and packing materials.

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Arrested were: Steven Croce, 29, of 245 Franklin Ave., Franklin Square; Aimee Slate, 25, of 16 Nelson St., Elmont; Pietro Ciampa, 28, of 825 Lawrence St., Elmont; and Richard Cincotta, 28, of 115-27 237th St., Elmont.

Police said that during an undercover operation in the Elmont area, Croce and Slate sold "a tan powder believed to be heroin" to officers. Both were arrested at 9:30 p.m.

Croce was found to be in possession of 100 white glassine envelopes containing "tan powder" believed to be heroin at the time of arrest, police said.

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Croce was charged with three counts of third-degree criminal possession of a controlled substance, plus two counts of third-degree criminal sale of a controlled substance.

Ciampa and Cincotta were arrested at 10:45 p.m., police said. Both sold heroin to officers, according to police. Ciampa had five 10-milligram Methadone tablets, according to court documents. And police found 13.3 grams of cocaine in Cincotta's basement, the documents said.

Slate and Cincotta were each charged with criminal sale and criminal possession, while Ciampa was charged with seventh-degree criminal possession of a controlled substance -- and with an unrelated probation violation, police said.

All four pleaded not guilty at their arraignments Wednesday in First District Court in Hempstead, said Paul Leonard, a spokesman for the Nassau district attorney's office. Slate was ordered held on $7,500 cash or bond; Croce on $15,000 cash or bond; Ciampa on $500 cash or bond; and Cincotta $10,000 cash or bond.

They each had court-appointed attorneys who could not be reached for comment.

With Nicole Fuller