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A video filmed in Ginza, a shopping district in Tokyo, showed a group of masked individuals robbing a luxury watch shop on Tuesday.
They wielded a knife while inside and threatened to kill the shop's sales clerks - smashing a display and fleeing the scene with stolen goods, Japanese broadcaster NHK reported.
Police say they believe the robbery was committed by three people who fled in a rented van that may have had replacement license plates.
No one was hurt.