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Steve McFadden, 49, of Plattsburgh, N.Y., gazes at Long Nook Beach in Truro, Mass., on Cape Cod, which was closed to swimmers in August after a man was attacked by a shark. Cape Cod authorities said they are concerned about the safety of beachgoers during the Labor Day weekend, but also in the days beyond when lifeguards leave but sharks remain. (William J. Kole, AP Photo File)

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BOSTON — As another beach season draws to a close on Cape Cod, researchers are trying to figure out what's driving the increase in shark sightings and encounters — including the state's first attack on a human since 2012.

By PHILIP MARCELO, Associated Press September 1, 2018