10 killed in Dayton mass shooting

At least 10 people were killed after a gunman opened fire in a Dayton nightclub early Sunday, targeting revelers in the Ohio city's Oregon Historic District. 26 more victims were reportedly injured. The shooter was shot dead by police within a minute.

The incident came only hours after a mass shooting in El Paso, Texas which left at least 20 people dead.

It also took place less than a week after three people were killed and 15 injured at a food festival in California.

Mayor Whaley ... said it was the 250th mass shooting in the US this year. But the Gun Violence Archive, which categorises mass shootings as four or more people shot or killed (excluding the shooter), said there have in fact been 251.