There is growing concern in Boston after a string of shoplifting incidents at two popular stores in Back Bay.

"We've had an increase in shoplifting across the board, across the nation, and that's no different here in Massachusetts," said Ryan Kearney, vice president and general counsel of the Retailers Association of Massachusetts.

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Last week, thieves were caught on camera stealing thousands of dollars of merchandise from Lululemon on Newbury Street. Surveillance video shows the suspects running out of the store with armloads of clothing. In that video, a sales associate is seen standing by watching the incident unfold, which is what Kearney said employees are advised to do in these situations.

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