SAN RAMON — Police have identified six men and a juvenile arrested after allegedly joining a large group that stormed into a San Ramon jewelry store, some carrying guns, and smashed cases, grabbed merchandise and fled in multiple stolen getaway cars, authorities said.

Arrested in relation to the Monday robbery of Heller Jewelers were Michael Ray, 31; Jimmy Ray, 27; Ira Austin, 19; Jahkeal McGolthin, 18; Jacques Samuel, 18; DeAndre Demisse, 19, and a 17-year-old boy.

On Thursday, the Contra Costa District Attorney’s Office announced charges against three of them: Michael Ray of San Francisco, Jimmy Ray of Vallejo and Austin, who lives in San Francisco. They each were charged with 13 counts of second-degree robbery and one count of conspiracy to commit a crime, with special enhancements du

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