HACKERS from China have "persistently" infiltrated the New York Times for the past four months, the US paper says.
It said the attacks coincided with its report into claims that the family of Chinese Premier Wen Jiabao had amassed a multi-billion dollar fortune.
The hackers used methods which have been "associated with the Chinese military" to target the emails of the report's writer, the paper said.
China's foreign ministry dismissed the accusations as "groundless".
"To arbitrarily assert and to conclude without hard evidence that China participated in such hacking attacks is totally irresponsible," said spokesman Hong Lei.
"China is also a victim of hacking attacks. Chinese laws clearly forbid hacking attacks, and we hope relevant parties takes a responsible attitude on this issue."
Beijing has been accused by several governments, foreign companies and organisations of carrying out extensive cyber espionage for many years, seeking to gather information and to control China's image.