[originaltext] [3]One dog has been killed and multiple dogs have been injure

[3]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 hour of the morning. [4]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 Hughe 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 finished land.
    Alaska State Troopers released a statement saying they’ve arrested Arnold Demoski, 26. He faces trial on several charges.
3. What is the news report mainly about?
4. What do we learn about Jeff King?