A woman whose phone was swiped on Muni was strangled after she tried to hunt down the robber early Thursday, but was saved by a fellow passenger, police said.
The 31-year-old victim chased two suspects off the bus at Ninth and Mission streets just before 2 a.m. One of the suspects pushed the woman against a wall and began to strangler her, police said.
But then a good Samaritan hopped off the bus to help. He put the aggressor in a chokehold until police arrived. The suspect, a 25-year-old man, was arrested.
The other suspect got away with the cellphone, police said.
The woman was not seriously injured.