Police in China cordon off the scene after a knife-wielding passenger ran amok on this bus, killing four passengers and injuring 11 others. The attack took place on Sunday night in the southwestern city of Chengdu. State media said the suspect began hacking at passengers before he got off the bus and attacked people on the street. Police then opened fire on the suspect and subdued him. Several victims, including a 10-year-old girl, remain in critical condition at a local hospital.