The latest high-profile mass shooting in the United States happened Saturday in Allen, Texas, where eight people were killed and seven were wounded at a busy outdoor shopping centre before police killed the gunman. The attack is the country’s 22nd mass killing – in which four or more people died, not including the assailant – of 2023, according to a database maintained by The Associated Press and USA Today in partnership with Northeastern University. Here are some other notable U.S. mass shootings over the past 12 months: Henryetta, Oklahoma An Oklahoma sex offender shot his wife, her three children and...