SF main library evacuated after person jumps off balcony

View of the atrium at the San Francisco main library on Friday, February 18, 2017, in San Francisco, Calif. View of the atrium at the San Francisco main library on Friday, February 18, 2017, in San Francisco, Calif. Photo: Liz Hafalia / The Chronicle / / Photo: Liz Hafalia / The Chronicle / / Image 1 of / 1 Caption Close SF main library evacuated after person jumps off balcony 1 / 1 Back to Gallery

San Francisco’s main library was evacuated on Thursday afternoon when a person jumped from an upper-story balcony into the atrium lobby below, police said.

The person jumped around 3:45 p.m. from a balcony near the Grove Street entrance of the library, prompting the evacuation, San Francisco police officials said.

Paramedics took the jumper to San Francisco General Hospital with life-threatening injuries.

Library was expected to remain closed for the day as police investigated the incident.

Evan Sernoffsky and Filipa Ioannou are San Francisco Chronicle staff writers. Email: esernoffsky@sfchronicle.com and fioannou@sfchronicle.com Twitter: @EvanSernoffsky and @obioannoukenobi