A flash-bang grenade tossed into a stash house on Forest Street Tuesday night kicked up powdered fentanyl and heroin that SWAT officers raiding the building breathed in, police said.
Eleven of the officers were taken to a hospital to be treated for their exposure to the deadly opioid.
Following weeks of investigating by Hartford and East Hartford detectives into a suspected heroin operation, they learned that heroin was being bagged at the apartment for street-level sale, Deputy Chief Brian Foley said.