The Wall Street Journal said on Thursday its computers had been hit by Chinese hackers, becoming the latest U.S. media organisation to report an effort to spy on its journalists covering China.

The announcement came a day after The New York Times said hackers, possibly connected to China's military, had infiltrated its computers in response to its expose of the vast wealth amassed by a top leader's family.

The Journal reported that the attacks were "for the apparent purpose of monitoring the newspaper's China coverage" and suggested that Chinese spying on U.S. media has become a "widespread phenomenon."

China did not immediately comment on the Journal's allegations, but on Thursday Beijing dismissed the Times's accusations as "groundless."AFP