A man was shot from behind in the lobby of a state corrections building in South of Market on Monday, according to police.

The man was taken to a hospital with injuries considered life-threatening at around 3:50 p.m. from the California Department of Corrections and Rehabilitation building at 13th and Mission streets, police said.

Officer Joseph Tomlinson, a police spokesperson, said the suspect fled the scene down 13th Street in a white vehicle.

Niether the suspect nor the victim worked for CDCR, Tomlinson said.

Tomlinson said the victim was shot in the upper torso.

Mele Haatoa, a homeless woman who lives near the facility, said she saw police running across the street to the building.

“It was scary,” Haatoa said. “The sirens were so loud. They were rushing so fast I knew that something was still happening and they were trying to stop it.”

A homeless shelter next door temporarily stopped allowing people to come in and out at the request of police during the response to the incident.