Customers in a grocery store, USA. File photoWASHINGTON, May 14.At least eight people were killed in a shooting at a supermarket in the US city of Buffalo, NBC reports, citing law enforcement sources. Among the dead is an alleged perpetrator. One of the wounded is in critical condition.According to media reports, a man dressed in military uniform entered one of the city's supermarkets and opened fire with a rifle. >Four people were injured in a shooting in the US state of Arkansas