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The results of an autopsy of Philip Seymour Hoffman's body were inconclusive, and more tests must be conducted to determine what caused his death, a spokeswoman for the New York City medical examiner's office said Wednesday.

There is no timetable for the undisclosed tests, she said.

The body of the actor, 46, was found Sunday on the bathroom floor of his New York apartment with a syringe in his left arm and bags of what appeared to be heroin inside the apartment. Those items were being tested. Police will only say the investigation is continuing.

The Associated Press reported two law enforcement sources said some packets of heroin were stamped with the ace of hearts symbol, and others with the words "Ace of Spades" and that symbol. Also, the AP said, tests confirmed it was heroin in at least some of the packets.

Hoffman has three children — Cooper, 10, Tallulah 7, and Willa, 5 — with costume designer Mimi O'Donnell.

Contributing: Associated Press

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