It's the type of cyber attack that the U.S. often accuses China of committing. China's National Computer Virus Emergency Response Center said it determined that the U.S. National Security Agency was responsible for breaching the network of Northwestern Polytechnical University in June. Chinese Foreign Ministry spokesperson Mao Ning said in a statement the NSA engaged in cyberattacks and data theft against Chinese people including more than 1,000 operations against the university. "As the most powerful country in cyber technology and capability, the U.S. must immediately stop abusing its tech strength for cyber theft and attacks," Ms. Ning said on Twitter....