A 24-year-old man was stabbed following an argument over a bus seat Tuesday on Staten Island, sources said.
The man was stabbed in the MTA bus near Broad and Canal streets in Stapleton shortly before 2 p.m., police said.
He and another man were fighting over a seat on the bus, sources said.
The victim was taken to Richmond University Hospital where he is in critical condition.
Police are searching for the stabber.