SAN FRANCISCO (CBS SF) — Police in San Francisco are investigating how a man died after he was found early Friday morning unresponsive near a lively intersection in the city’s Castro neighborhood.

At 12:52 a.m., officers responded to a report of a person down on the ground near the corner of 18th and Castro streets, police said.

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Officers found the man and called for assistance. Medical personnel arrived and pronounced him dead at the scene, according to police.

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The investigation is ongoing, police said. The medical examiner’s office is investigating.

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