According to officials, two Asian women in their 60s and 80s were at a bus stop when they were attacked.
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"I'm kind of worried because my back was turned, it could have been me instead," said Patricia Lee, who was working at the flower stand just a few yards from the bus platform, when she saw a man walk by with a knife in his hand.
"It was a pretty big knife, it had knuckles on the handle and the blade had holes in there like a military knife," Lee described.
Lee says she saw one of the women get attacked, "Her back was turned and all I see was the feathers coming out of her jacket, so I'm very sure that she got sliced."
After the stabbing, Lee says the suspect did not run, that "he walked away like nothing happened, like Sunday morning."
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She now says she feels unsafe.
"I feel like we do need more officers patrolling," she said.
Armed with witness photos of the suspect, officers canvassed downtown San Francisco and looked for part of the knife at a construction site.
Less than a mile from the scene, police arrested a suspect, a 54-year-old San Francisco man.
"This is happening to Asian people in our community specifically, this is a pattern," said San Francisco Supervisor Matt Haney.