Four Dead, Three Injured In Denver-Area 'Shooting Spree'

A shooting incident in Denver left four people dead and three injured, including a police officer. The suspected shooter was also killed after an exchange of gunfire with police. The incident occurred at four significant locations, and the suspect was tracked down by police using a car description. The investigation is ongoing, and the motive remains unknown.

How many significant locations were identified where gunfire took place?

What is currently unknown regarding the incident?