O'Brien says, "It's not a danger to the public at this time, but i do want to emphasize that but certainly in the processing of that scene we need to do that very carefully, because it definitely is a hazmat site at this point".
Of the 12 overdose victims, four remained in critical condition hours after authorities responded to a 911 call around 9 a.m.
Chico Fire Department Chief, Steven Standridge, said the pair were "potentially exposed" to fentanyl, which is a synthetic opioid that is frequently mixed with heroin.
At least one person is dead and 12 others were hospitalized after a suspected mass Fentanyl overdose, said police in Chico, California.
Cops were reportedly called to the Chico address at around 9am and treated the overdosing victims, who were all known to each other, with opioid treatment naloxone. Responding officers performed CPR at the scene and provided six victims with doses of naloxone, medicine that can treat narcotic overdoses in emergency situations.
Four of those people admitted to the hospital were listed in critical condition, O'Brien said, adding there is "potential for additional fatalities", Fox reported.
Two police officers who responded became ill and were treated and released from a hospital, O'Brien said.
The victims were between the ages of 19 and at least 30, he said.
New Bottled Brews Delayed By Government Shutdown
As a result, Washington, D.C., craft brewer Atlas Brew Works can't distribute its new apricot I.P.A., "The Precious One". That's a problem for beermakers like Joe Katchever, owner and brewmaster of Pearl Street Brewery in La Crosse, Wis.
The home is now being treated as a "hazmat site", but O'Brien said it is "not a danger to the public".
O'Brien said investigators believe the overdoses were caused by ingestion of some form of fentanyl and another substance that has not yet been identified.
The drugs are "extraordinarily risky", O'Brien noted, saying that even small amounts can be life-threatening, according to the Bee.
Chico Police Chief Michael O'Brien said the main substance involved is believed to be fentanyl - the most commonly used drug in overdoses, according to a recent government report.
Fentanyl is a synthetic opioid that is 80-to-100 times stronger than morphine, according to the US Drug Enforcement Administration.
Over the past few years, Fentanyl has increasingly been responsible for overdose deaths across the United States.
"'That is changing unfortunately, and now we've had this mass casualty incident... likely to have been cause by fentanyl".
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