Sept. 19 (UPI) -- U.S. authorities have thwarted another China-backed botnet, freeing hundreds of thousands of infected devices in the process, FBI Director Christopher Wray said. The head of the United States' domestic intelligence and security service made the announcement Wednesday during his keynote speech at a cyber summit in Washington, D.C. Advertisement He said the botnet was operated by the Chinese government-sponsored hacker group known as Flax Typhoon who used it to target critical