Lethal mixtures of opioids called "gray death" because of their concrete color and texture have been blamed for 11 fatal overdoses over three days in Western Pennsylvania.
The drug combinations include fentanyl and cocaine; fentanyl and heroin; and fentanyl, heroin and cocaine.
They are believed to responsible for the deaths that occurred from Saturday through Monday in and round Erie County, LancasterOnline reported.
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The mixtures are also blamed on other deaths in Alabama, Georgia, and Ohio, the Associated Press reported.
Because the drugs can be absorbed through the skin, any contact with the powder can put people at risk, the Associated Press reported.
"Gray death is one of the scariest combinations that I have ever seen in nearly 20 years of forensic chemistry drug analysis," Deneen Kilcrease, manager of the chemistry section at the Georgia Bureau of Investigation, told the AP.