A police officer shot dead a man suspected of stabbing a customer in a shop, in an altercation over face masks.
The incident occurred in the US state of Michigan.
Police said the incident began in Quality Dairy store in Dimondale, a convenience store near Lansing, where the suspect, Sean Ruis, attacked a 77-year-old man who had challenged him for not wearing a mask.
The elderly man is in hospital and said to be in a stable condition.
They say Ruis fled the scene in a car.
He was later pulled over by deputy sheriff, who opened fire when Ruis lunged towards her.
Police say Ruis, 43, was carrying a weapon. He was taken to hospital, where he was declared dead.