PORT ORCHARD — Kitsap County Coroner Jeff Wallis is warning residents that the powerful, often deadly drug fentanyl is causing a significant number of overdoses in neighboring King County.

Of those overdoses, 10 of them have resulted in deaths, according to King County’s medical examiner.

“There is new evidence of fentanyl being sold in rock form in King County,” Wallis said in a news release on Friday.

Wallis said history has shown that overdose substances in King County generally migrate to Kitsap County within a week. He believes the laced powder is likely already in circulation in Kitsap communities.

“If you or someone you know is using rock or powdered drugs (especially those who believe they are using crack or powder cocaine), be aware it could be fentanyl or contain fentanyl,” he said.

Wallis said if you or someone you know is experiencing addiction, it’s imperative to make every effort to get professional treatment as soon as possible. If you’re using the drug, never use it alone. If you are witnessing someone exhibiting signs of an overdose, call 911 immediately.

To find resources for drug treatment, call the Washington Recovery Help Line at 1-866-789-1511 or visit stopoverdose.org.