One dog has been killed and multiple dogs have been injured by a snowmobile driver in what appears to be an intentional attack on competitors in the Iditarod Race in Alaska. Aliy Zirkle was the first to report an attack. A snowmobile driver had repeatedly attempted to harm her and her team, and one of Zirkle' s dogs had received a non-life-threatening injury. Zirkle reported the attack when she arrived in Nulato, Alaska, in the early hours of the morning. Then Jeff King, a four-time champion, reported a similar attack. His team was hit by a snowmobile driver, injuring several dogs and killing a 3-year- old male dog. Reporter Zachariah Hughes says that neither King nor Zirkle was injured. Although this incident very much alters the race of the two participants competing for a win, both are going to continue on their way toward the finishing line. Alaska State Troopers released a statement saying they've arrested Arnold Demoski. He faces a trial on several charges. Question 1: What is the news report mainly about? Question 2: What do we learn about Jeff King?