One person was killed and four others were injured late Monday in a shooting in downtown Denver in which a gunman opened fire on a crowd of mostly homeless people, authorities said. The incident occurred just after 4 p.m. in a crowded area near Coors Field. Police say the gunman, or gunmen, remains at large and they have not yet determined a motive for the attack. “It is too early to be able to say what the motive is here or what exactly happened,” Denver Police spokesman Doug Schepman told reporters. Hisam Derani, a resident who said he witnessed the shooting, told The Denver Post he’d seen the gunman get into a car after firing on a crowd of homeless and indigent people. Derani said someone in the crowd had fired back at the shooter as he fled. Police have not yet confirmed how many suspects were involved or provided a description.