What is known about the shooting in Dayton, Ohio

When a gunman opened fire on revelers enjoying a night out in Dayton, Ohio, early Sunday, he killed nine people, including his sister, in less than a minute.

What is known about the shooting in Dayton, Ohio. See story here. https://wgntv.com/2019/08/04/what-we-know-about-the-shooting-in-dayton-ohio/