A、When the price fell to its lowest level. B、When gold prices reached investors’ set targets. C、When lots of physical gold was c

(1)The price of gold fell to its lowest level in five years in trading early Monday. For a time, gold was selling at less than 1 100 dollars an ounce on Asian markets. Some traders are calling the price drop a "mini flash crash."
   Thirty billion dollars in short selling took place within half an hour during what are known as "stop-loss" sell-offs. (2)Traders executed sell orders when gold prices reached targets set by investors. The sales manager of a Singapore business that sells gold and other precious metals says, "In the physical market, this would not be possible because that would consume a whole lot of physical gold. But in the futures market, because it’s all digital as long as you find a buyer to bid for it, then that would be possible. "
1. What is the news report mainly about?
2. When did traders sell gold?