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MILWAUKEE, Wisconsin (WTMJ) --Local and federal law enforcement are on the hunt for a 300-year-old Stradivarius violin stolen Monday in a violent armed robbery in Milwaukee, Wisconsin.

The so-called Lipinski Stradivarius was on permanent loan from its anonymous owners to Milwaukee Symphony Orchestra concertmaster Frank Almond.

Milwaukee Police Chief Ed Flynn said Almond was attacked after a concert Monday night on the campus of Wisconsin Lutheran College. According to Flynn, an attacker hit Almond with a stun gun and grabbed the violin as it fell to the ground. The thief escaped in a maroon minivan driven by an accomplice.