77-year-old man shot during robbery in SF Mission District

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A 77-year-old man was in life-threatening condition after he was shot by robbers who targeted him and two other victims at a building in the Mission District of San Francisco, police said Tuesday.

The incident occurred about 5:20 p.m. Saturday in a building on the 2300 block of Mission Street, according to the San Francisco Police Department.

Four suspects walked into the building and held three men at gunpoint, robbing them and leaving one with a gunshot wound, police said.

The shooting victim was taken to a hospital with life-threatening injuries. The two other victims, ages 60 and 63, were not harmed.

No arrests were made and police were working Tuesday to identify the robbers. Police did not provide detailed descriptions of the four assailants or disclose what was taken during the robbery.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani