Four people are behind bars and a fifth is fighting for his life after a Mid-Market shooting on Tuesday evening.

According to San Francisco Police Department spokesperson officer Gordon Shyy, SFPD officers were called to Market Street between Fifth and Sixth Streets at 7:50 Tuesday night on the report of a shooting. When they arrived, witnesses told them that a group of people had approached a man on the street and "an altercation ensued," Shyy says.

In the melee, the man was shot, and took shelter in, the Chron reports, the tony Westfield Centre mall. He was transported to San Francisco General Hospital with life-threatening injuries, Shyy says.

According to a Nordstrom Rack staffer who spoke with the Chron, at least three gunshots were fired in the confrontation.

Witnesses were able to provide SFPD with descriptions of the suspects, who Shyy says were tracked down a block away on Stevenson Street, near Mint Plaza. Two men and two women, none of whom have been publicly identified by SFPD, were subsequently arrested in the shooting, Shyy says.

SFPD is, Shyy says, still trying to determine a motive in the shooting. At publication time, the victim remains hospitalized with critical injuries.