A knife-wielding man killed two people and injured two others at a primary school in central China on Wednesday, the latest such attack to hit the country in recent years.
Two police officers approached two sleeping men and asked them to move on. One then pulled out a knife and refused to drop it when asked.
Four of the victims were in a critical condition, police said, after the man brandishing a large blade and and iron bar went on the rampage in Paris.
Brazil's right-wing presidential frontrunner Jair Bolsonaro was stabbed and seriously injured while campaigning Thursday, with police saying the suspect claimed to be acting on orders from God.
Two American citizens -- both believed to be male -- were seriously injured when a knife-wielding man attacked bystanders around noon on Friday at the busy station.
A 54-year-old woman died on Saturday after another woman went on a stabbing spree at a museum in northern Italy, local media reported.
A knife attacker on Friday stabbed two people at Amsterdam's Central Station before being shot by police, Dutch police said.
A knifeman killed his mother and sister in the Paris suburb of Trappes on Thursday and seriously wounded a third person, a French Interior Ministry source said.