Microsoft also launched its own investigation that year, finding that some interception had begun in July 2009 and had compromised the emails of top Uighur and Tibetan leaders in multiple countries, as well as Japanese and African diplomats, human rights lawyers and others in sensitive positions inside China, two former Microsoft employees said. Some of the attacks had come from a Chinese network known as AS4808, which has been associated with major spying campaigns, including a 2011 attack on EMC Corp's security division RSA that U.S. intelligence officials publicly attributed to China. Microsoft officials did not dispute that most of the attacks came from China, but said some came from elsewhere.