02:03 - Source: CNN AP
Eerie photo of actor one of his last

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Source: Heroin recovered does not contain fentanyl

Such a combination has claimed lives in Maryland and Pennsylvania

(CNN) —  

Four people believed to be connected to the drugs found in Philip Seymour Hoffman’s apartment were arrested late Tuesday night, law enforcement officials told CNN.

No additional information was released.

Hoffman’s final hours

When police were called to Hoffman’s fourth-floor Manhattan apartment Sunday, they found the actor lying on the bathroom floor with a syringe in his left arm. He was wearing shorts and a T-shirt, his eyeglasses still resting on his head, according to law enforcement sources familiar with the inquiry.

Investigators discovered close to 50 envelopes of what they believed was heroin in the apartment, the law enforcement sources said. They also found used syringes, prescription drugs and empty bags that authorities suspect are used to hold heroin, the sources told CNN.

How heroin kills you

Also Tuesday, preliminary tests showed the heroin recovered from the apartment does not contain fentanyl, a law enforcement official told CNN.

More testing will be done, but as of now no fentanyl has been detected.

Fentanyl is a powerful narcotic used to treat cancer patients’ pain.

Last week, Maryland officials said that heroin tainted with fentanyl had claimed at least 37 lives since September. And last month, at least 22 people in western Pennsylvania died after using heroin that had been mixed with fentanyl.