RELATED: Suspect arrested following stabbing on SF Muni bus, police say
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The victim is recovering from the life-threatening injury on Wednesday, police said.
The unprovoked stabbing happened Monday afternoon on a bus near Stockton and Sutter streets, close to San Francisco's Union Square, according to police.
RELATED: Person stabbed on Muni bus in San Francisco, police say
The 12-year-old boy was arrested and booked on suspicion of attempted homicide, and for an unrelated stabbing and robbery incident from last week.
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The video in the player above is from a previous report.
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