Seven overdoses in one area in a single night have made Seattle and King County warn.
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"There are overdoses that occur every day, but the unusual thing is that these overdoses occurred in a few hours, and in a relatively small area," said Jeff Duchin of Seattle and King County Public Health at KIRO Radio .
While the main cause of overdoses has not been identified immediately, there are suspicions that a recent supply of contaminated drugs could be the cause.
The first rescuers of the seven overdose scene reported that some victims injected what they thought was heroin, and others sniffed a crushed pill that may have been Fentanyl.
Fentanyl can be found in counterfeit pills made to resemble prescription opiates like oxycodone. The risk stems from the fact that fentanyl is anywhere from 30 to 50 times stronger than pure heroin; a small dose of grains of salt can be fatal.
Data released by the Washington State Health Department last December found that excessive doses of fentanyl increased by nearly 70 percent from the previous year.
Seattle and King County advise people who use illicit drugs to pay special attention, do not use drugs alone, and have naloxone ready to counteract the first effects of an overdose.