SAN FRANCISCO (CBS SF) — A 30-year-old woman suffered a heart attack while running a half-marathon in San Francisco Sunday, a fire dispatcher said.

Paramedics responded to a report of a collapsed runner taking part in the San Francisco Rock n’ Roll Half Marathon near Marina Boulevard and Laguna Street at about 9:45 a.m., according to San Francisco Fire Department dispatch.

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The woman was in cardiac arrest and was revived by paramedics, the dispatcher said.

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She was taken to a hospital where she remained in serious condition, the dispatcher said.

A spokesperson for the race did not immediately return a call seeking more information.

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