Nicholas Berg, age 36, undomiciled, was arrested around noon on Wednesday, Feb. 2, by Riverhead Police after the incident at the Gala Fresh Supermarket, located at 795 Old Country Road.
According to police, Berg was seen inside the store removing items from the market without paying for them.
When confronted in front of the store, Berg displayed a knife, police said.
Berg was arrested and charged with robbery and remanded to the Suffolk County Correctional Facility without bail.
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