Yosemite National Park was closed Friday and hundreds of people ordered evacuated

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A team was being sent to the Mariposa Grove to wrap some of the massive trunks in fire-resistant foil to protect them as the blaze burned out of control

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More than 500 mature sequoias were threatened but there were no reports of severe damage to any named trees

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The cause of the fire was under investigation

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nearly 300 firefighters tried to control the flames with the help of two water-dropping helicopters

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Lightning-sparked wildfires over the past two years have killed up to a fifth of the estimated 75,000 large sequoias

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There was no obvious natural spark for the fire that broke out Thursday next to the park’s Washburn Trail

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Smoke was reported by visitors walking in the grove

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nside the park’s southern entrance, was evacuated and no one was injured., Phillipe said.

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The fire had grown to 466 acres (188 hectares) by Friday evening, authorities said.

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