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A beach was briefly evacuated after lifeguards spotted a shark swimming unusually close to shore.
then quickly recognized as a shark. Lifeguards used sirens and loudspeakers to clear swimmers within minutes,
and the shark soon moved back into deeper water.
Marine biologists say factors like warmer ocean temperatures, shifting prey,
or human activity may be drawing sharks nearer to shore.

Local officials have increased beach surveillance and reminded visitors to follow safety guidelines.
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