St. Helena police on Monday remained on the alert for a man who robbed the downtown Azteca Market with a firearm the previous evening and fled into a nearby neighborhood, prompting a yard-to-yard search.

The robbery took place at 789 Main St. at 5:59 p.m. Sunday. Police on Monday morning didn’t reveal what was stolen because they said the investigation is still underway, but said no one was hurt.

The suspect is a man 5 feet, 5 inches to 5 feet, 8 inches tall, with a thin build, Sgt. Justin Tharp said. The incident was captured by surveillance camera.

“He was dressed heat-to-toe in black, nothing showing,” Tharp said.

The suspect ran south into a neighborhood near St. Helena High School. Seven or eight St. Helena police and Sheriff’s officers searched an area the size of a city block with two canines for about an hour, to no avail. A California Highway Patrol fixed-wing aircraft with infrared flew overhead.

St. Helena police asked residents in the area by Nixle to stay indoors during the search. At 7:05 p.m. Sunday, police released a message saying police activity had concluded, but that the suspect was still at large and to report all suspicious activity.

Police ask anyone with information on the case to call Officer Todd Heald at 967-2850.

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Napa County Reporter

Barry Eberling covers Napa County government, transportation, the environment and general assignments. He has worked for the Napa Valley Register since fall 2014 and previously worked 27 years for the Daily Republic of Fairfield.