Philip Seymour Hoffman

The New York Police Department has arrested four suspected heroin dealers with possible connections to the apparent overdose of Philip Seymour Hoffman, whose autopsy has come back inconclusive.

"Four people were arrested earlier this evening under suspicion of narcotics offenses but whether they are connected to the Hoffman death or not is still under investigation, and the case is still developing," NYPD Detective Antonetti told The Hollywood Reporter.

The too-short career of Philip Seymour Hoffman

According to The New York Times, more than 350 bags of heroin were seized from the three apartments police raided in lower ManhattanTuesday evening. The paper reports that law enforcement was led to the location by information stemming from the investigation into Hoffman's death.

The actor, who relapsed last year after 23 years of sobriety, was found dead Sunday with a needle in his arm and dozens of bags of heroin, some branded "Ace of Spades." The bags found during the arrest of the three men and one woman did not have that label, a law enforcement official told the Times.

Hoffman's autopsy results were inconclusive, the New York City medical examiner announced WednesdayAdditional tests, including a toxicology report, will now be done, but those may take anywhere from a few days to weeks.