(SAN RAMON, Calif.) — A group of nearly 25 people ransacked a jewelry store in San Ramon, California, this week, stealing an estimated $1 million worth of merchandise, police confirmed to ABC News.

Seven suspects have been detained, so far, and some of the jewelry has been recovered, the San Ramon Police Department said.

The group looted Heller Jewelers, located at the City Center Bishop Ranch shopping mall, on Monday afternoon and was armed with at least three guns, according to police. Video obtained by ABC News’ San Francisco station ABC7 shows the masked mob storming the store and smashing displays with crowbars and pickaxes before being locked inside by automatic closing doors.

This is the second time in two years Heller Jewelers has been targeted in a massive heist, when a group o

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