A car plowed into a line of tourists waiting to visit the Coors Brewery on Saturday and injured 12 people, authorities said.
The driver had apparently blacked out, police Sgt. Bob Tortora said.
Witnesses said the compact car struck people waiting for a tour bus, bounced off a wall, then continued around a drive and back onto the street.
The driver was among six people hospitalized in fair condition.
Two were in serious condition, both with broken legs. The others were treated and released.