A gunman identified as Joe Jackson fatally shot 3 people and held a hostage at gunpoint in Chicago over what authorities are calling a patent dispute surrounding a toilet seat invention.

• 在芝加哥；一名持枪歹徒在一个坐便器发明专利的研讨会上枪杀了3个人并挟持了一名人质；该持枪歹徒被确认为乔.；杰克逊。