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Four people who might have supplied the heroin that killed late actor Philip Seymour Hoffman over the weekend have been arrested by the New York Police Department at a Chinatown apartment, the New York Daily News is reporting.

Police raided the apartment at about 7 p.m. and tood the four drug dealers into custody, the News reports.

The 46-year-old actor was found Sunday lying on the bathroom floor of his Greenwich Village apartment with a syringe in his arm.

Investigators found about 50 envelopes of what they believe is heroin, along with used syringes, prescription drugs and empty bags, CNN says the sources report.

Investigators also found addiction treatment medication, blood pressure medication and a muscle relaxant, according to NBC News and CNN.

No traces of the powerful pain reliever fentanyl was found in the heroin, a police source told the News. Heroin laced with fentanyl has killed more than 20 people in Pennsyvania, the News reports.

A private funeral will be held Friday in New York City, People magazine reported. Plans also are underway for a memorial service in New York later in the month, according toPeople.

Hoffman was last seen alive Saturday night and his body was removed from the apartment on Sunday night.

Hoffman has three children with Mimi O'Donnell, a costume designer.

Broadway theaters plan to dim their marquee lights for one minute starting at 7:45 p.m. Wednesday in Hoffman's memory.

Contributing: Donna Freydkin

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