Police and the FBI are now investigating four bomb threats on Nantucket over the past week. All four incidents were determined to be false reports.

The latest incident happened on Saturday night.

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Nantucket police said all four calls have threatened to place an explosive device at 16 Main St. which is home to a Ralph Lauren store. Each time, the area was searched and cleared by a bomb squad.

On Saturday night, police said the Nantucket Communications Center received a call around 10:30 p.m. from someone saying they intended to place an improvised explosive device at 16 Main St.

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