None of the 27 people who overdosed on a suspected bad batch of drugs Thursday in Baltimore’s Penn North neighborhood have died, according to Mayor Brandon Scott.

A mass overdose in West Baltimore affected around 25 people, highlighting the strain Baltimore’s opioid crisis places on emergency services. Community leaders are calling for lasting solutions rather than temporary fixes.

An unusually large number of overdoses sent crews searching alleys and homes for victims. Officials have not said what type of drug was involved.