A 62-year-old man was taken to the hospital with life-threatening injuries after being punched and knocked to the ground in the Mission, police said Monday.
The victim got into an argument with a 34-year-old man near 16th and Valencia streets at around 5 p.m. on Friday, according to police.
Police said the conflict escalated into a physical confrontation and the suspect punched the victim, who lost consciousness and fell to the ground.
Officers arrested the suspect at the scene, but had not released his identity as of Monday morning.
Police did not respond to an inquiry about his condition as of Monday morning.