LYNN, Mass. (AP) — The owner of a Massachusetts convenience store says he fired a clerk who was robbed three times in two weeks to try to stop the spate of thefts.

Mohammed Ali, owner of Highland Variety in Lynn, tells the Daily Item (http://bit.ly/2vNNwE8 ) that he suspects the thief might have kept coming back because he knew the 49-year-old clerk would hand over the money. He said putting a different person behind the counter might discourage future crimes.

The store was robbed July 23, July 28 and Aug. 6. Police say each time a knife-wielding man got away with a small amount of cash.

Police say they are not sure if the same person committed all three robberies, but noted that three crimes occurring in such a short time period is unusual.

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Information from: The (Lynn, Mass.) Daily Item, http://itemlive.com