China-based hackers stole Indian national security information, 1,500 e-mails from the Dalai Lama's office and other sensitive documents, a new report said Tuesday. Researchers at the University of Toronto said they were able to observe the hacking and trace it to core servers located in China and to people based in the southwestern city of Chengdu. The researchers said they monitored the hacking for the past eight months. The report said it has no evidence of involvement by the Chinese government, but it again put Beijing on the defensive.