A Minneapolis police officer trailing a group of robbery suspects in an unmarked vehicle late Friday night on the city's North Side rounded a curve into a volley of automatic gunfire that left him with a shoulder wound.
Officer Jacob Spies, a seven-year veteran of the department, was rushed to North Memorial Health in Robbinsdale, where he was treated and discharged.
Minneapolis Police Chief Brian O'Hara, who described the shooting as an ambush, said on Saturday that the gunmen might not have realized they were targeting a police officer.
"I cannot say whether the the suspects in the vehicle believed he was the police or believed he was someone else," O'Hara said at an afternoon news conference with Mayor Jacob Frey. "But it's clear from what happened that they were trying to kill whoever was in that car."
The officer was dressed in an understated blue Minneapolis police T-shirt rather than full uniform and may not have been readily identifiable, O'Hara said.
Four suspects, including a teenage boy, were later taken into custody. Investigators also recovered an unregistered "ghost gun," a firearm that lacks serial numbers.
It's not immediately clear whether the gunmen fired from inside their vehicle or while standing on the street.
The attack occurred on an unusually bloody night in Minneapolis that sent nearly all available police squad cars screaming to priority 1 calls, including a mass shooting on the city's South Side that killed one and injured six others, and a fatal domestic stabbing.