The Financial Times is reporting that "a senior US official" is quoted as saying the Pentagon had pinpointed the China's People's Liberation Army (PLA) as responsible for a computer infiltration at the US Defence Department. This on the heals of German accusations that China had hacked it's systems... seems China and the US exchange these probes all the time but this time “The PLA has demonstrated the ability to conduct attacks that disable our system...and the ability in a conflict situation to re-enter and disrupt on a very large scale,”
