It's a sad day for everyone when our Venn diagram of stabbing news and Muni news overlaps, as it did last night with a bus stabbing in the Tenderloin. Around 7 p.m., the driver of a 31-Balboa bus was stabbed by a knife-wielding assailant while attempting to remove the man from his bus.

CBS reports that the 52-year-old driver pulled over near Eddy and Taylor streets after a passenger alerted him that another passenger had a knife. According to police spokesman Officer Gordon Shyy, the driver called the police, but was approached by the armed suspect while waiting for cops to arrive on the scene. The suspect demanded that the bus continue on its route, but when the driver attempted to boot him from the bus, the suspect stabbed him in the leg.

Police arrested the suspect, identified as 47-year-old San Francisco resident David Choy. In addition suspicion of assault with a deadly weapon charge and resisting arrest, Choy is wanted in violation of probation and has multiple local warrants out on him. The bus driver was hospitalized for non life-threatening injuries.

Update: SFPD has released Choy's mugshot.

[CBS]

(Courtesy: SFPD)