Four people questioned in connection with heroin inside Philip Seymour Hoffman's home

New York City police have questioned four people in connection with heroin found inside actor Philip Seymour Hoffman's apartment after his death, CNN reported on Tuesday.

Citing an anonymous police official, CNN also reported that preliminary tests of the almost 50 bags of heroin recovered from Hoffman's home showed no traces of fentanyl. The chemical has previously been found in the batches of "bad heroin" blamed for 27 fatal overdoses in Pennsylvania and Long Island in the past week. Another 37 people in Maryland have died from overdosing on heroin laced with fentanyl since September 2013.

However, WCBS-TV reported that several of the bags were labeled "Ace of Spades" and "Ace of Hearts," street labels for heroin batches commonly containing fentanyl.

Hoffman was found dead on Sunday, and police have not officially listed his cause of death, instead waiting for his autopsy to be completed.

[Image: "New York - Nov 20: Philip Seymour Hoffman Attends The Premiere Of Hunger Games: Catching Fire" on Shutterstock]