A beach on Massachusetts' North Shore has been closed to swimming after a shark sighting on Thursday.

The Gloucester Beaches account, which is run by the city, posted a beach advisory on Facebook just before 12:30 p.m. Thursday saying that they were closing the water at Good Harbor Beach following a reported shark sighting at Long Beach.

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They said the harbormaster is investigating.

"Please stay out of the water until further notice and follow lifeguard instructions," the message said.

The city had already issued a beach advisory on Wednesday warning of strong surf and rip currents starting Thursday and running through the weekend as a result of Hurricane Erin.

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