In Las Vegas, investigators say Harris was driving a black Range Rover SUV when he fired shots into a Maserati before dawn Thursday, killing an aspiring rapper and causing a crash that killed two people when the Maserati slammed into a taxi that exploded in a fireball at the heart of the Strip.
Police said several other people were with Harris in the SUV as it fled the scene of the six-vehicle, chain-reaction crash on Las Vegas Boulevard near the Bellagio, Caesars Palace, Bally's and Flamingo resorts.
Jones and police homicide Lt. Ray Steiber said they were confident that Harris was the only shooter. They didn't say whether police intend to prosecute anyone else in the SUV.
But, "To anyone who is aware of his location or is assisting Ammar Harris in any way, you will be arrested and prosecuted," Jones said. "You may think you're being a friend, but keep in mind Ammar Harris is wanted for the murder of three citizens."
The SUV was the focus of an intense search before it was found Saturday parked in the garage of a gated apartment complex just a couple of blocks east of the Strip. Harris wasn't found at a nearby apartment where he was believed to have been living.
Kenneth Wayne Cherry Jr. was mortally wounded when the dark gray Maserati he was driving was peppered by gunfire from the SUV. Taxi driver Michael Boldon, 62, of Las Vegas, and passenger Sandra Sutton-Wasmund, 48, of Maple Valley, Wash., died in the taxi.
Police say the triple homicide stemmed from an altercation between Cherry and Harris in a valet area of the upscale Aria resort a block south of the crash scene at Las Vegas Boulevard and Flamingo Road.
A passenger in the Maserati was wounded in the arm, and four people from four other vehicles were treated for non-life-threatening injuries after the crash.
Las Vegas police sought help during last week's search for the Range Rover from local and federal authorities in Nevada and neighboring states of Arizona, California and Utah.
Associated Press writer Kate Brumback in Atlanta contributed to this report.