(ONN) – Coroners in Ohio are issuing new warnings following a spike in drug overdose deaths.

Ten overdose deaths were reported in the first ten days of July in Montgomery County, which is home to Dayton.

Montgomery County Coroner Doctor Kent Harshbarger says street drugs, including cocaine, may be laced with fentanyl.

The Franklin County Coroner in Columbus reported nine overdose deaths between Saturday and Monday.

Statewide, there were more than 4,800 unintentional fatal overdoses in 2017, the most recent year for which statewide numbers are available.