According to the Wall Street Journal, US officials suspect someone in the cockpit deliberately wrecked a China Eastern flight that crashed in southern China in March.

On March 21, a Boeing 737-800 flying from Kunming to Guangzhou crashed from its cruise altitude of 29,000 feet into a hillside, killing all 132 persons on board. It was the deadliest aircraft tragedy in mainland China in over 30 years.

The flight data recorders recovered from the accident site were brought to the US for processing, and they reveal that someone – potentially a pilot or someone who forced their way into the cockpit – entered commands to send the aircraft into a plunge.

“The plane did what it was told to do by someone in the cockpit,” The Journal was told by a source acquainted with the early evaluation by specialists on the US National Transportation Safety Board.

During the quick fall, the pilots did not reply to numerous requests from air traffic controllers and surrounding planes, according to police. According to a Reuters source, authorities are investigating whether the accident was “voluntary.”

On Wednesday morning, screenshots of the Wall Street Journal piece seemed to have been filtered on Weibo, China’s Twitter-like platform, and messaging app WeChat.

In reaction to internet rumors of a planned crash, China’s Civil Aviation Administration stated on April 11 that the conjecture had “gravely misled the public” and “interfered with the accident investigation process.”

Boeing and the NTSB both declined to respond to news organizations, referring questions to Chinese officials. China Eastern did not reply quickly to calls for comment.

Investigators discovered no evidence of “anything odd,” according to a Boeing report, stated China’s Civil Aviation Administration (CAAC) in April.