Man badly injured breaking up BART station fight at Hallidie Plaza

An SFPD patrol car. An SFPD patrol car. Photo: Filipa Ioannou Photo: Filipa Ioannou Image 1 of / 15 Caption Close Man badly injured breaking up BART station fight at Hallidie Plaza 1 / 15 Back to Gallery

A man who tried to break up a fight Monday afternoon in Hallidie Plaza, near the Powell Street BART station, suffered life-threatening injuries after being struck with a handlebar, authorities said.

San Francisco police received a report at 2:57 p.m. about a fight between a 22-year-old man and a 21-year-old man. When a 57-year-old man intervened, one of them allegedly struck him with a handlebar.

The man was taken to the hospital with life-threatening injuries, police said.

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One of the two men involved in the fight was arrested on suspicion of aggravated assault.

Sophie Haigney is a San Francisco Chronicle staff writer. Email: sophie.haigney@sfchronicle.com Twitter: @SophieHaigney