Stabbing on San Francisco Muni bus leaves man seriously injured

San Francisco police said a stabbing on a Muni bus left one person injured Monday evening. 

The stabbing was reported just before 5 p.m., near Geary Boulevard and 14th Avenue. 

Police said they were told by witnesses they saw a man who was suffering from a stab wound. The victim was given first-aid and taken to a hospital with life-threatening injuries. 

There was no information about a suspect, and police said no arrest had been made. 

Anyone with information is asked to call police at 415-575-4444.