The first observed intrusion was detected on September 26 one day after President Barack Obama hosted President Xi Jinping of China for a State visit. The agreement with China doesn’t prohibit spying for national security reasons, but it does ban economic espionage. Many of the attacks were undertaken by a number of known Chinese groups, including the group known as Deep Panda. The group, which has ties to the Chinese military, is suspected of being behind the attacks at Anthem earlier this year. The Chinese Foreign Ministry said that the government opposes all forms of hacking or stealing commercial secrets.”]