An electronic spy network, based mainly in China, has infiltrated computers from government offices around the world, Canadian researchers say.
Experts at the University of Toronto said the network had infiltrated 1,295 computers in 103 countries.
They include computers linked with the Dalai Lama - Tibet's spiritual leader.
The researchers say they have no conclusive evidence that the Chinese government is involved. Beijing has denied any involvement.
The researchers were acting on a request from the Tibetan spiritual leader's office to check whether the computers of his Tibetan exile network had been infiltrated.