NEWPORT BEACH (CBSLA.com) — Lifeguards on Friday reopened a stretch of beach following a shark sighting in Orange County.

Just after 4 p.m. on Thursday, Orange County lifeguards were notified of a shark sighting off Huntington State Beach by a lifeguard patrol boat.

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A shark bumped a surfer’s board, which is considered to be aggressive behavior.

Although the shark did not bite the surfer, lifeguards were forced to close a portion of the coastline between Huntington State Beach and Newport Beach.

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According to lifeguards, towers 76-54 were affected by the closure.

Red flags were placed along the shoreline, however, some people ignored the warning to stay out of the water.

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Just before 11 a.m., lifeguards announced the beaches had reopened to the public.