The China Eastern Boeing 737-800 went into a sudden nosedive, appeared to briefly recover, and then slammed into the ground in a mountainous area on March 21. The crew made no report of problems before losing contact with air traffic control.

One month after a China Eastern passenger jet crashed mid-flight, killing all 132 people on board, investigators say they have not determined a cause, AP reports.

A report issued Wednesday by the Civil Aviation Administration of China said no abnormalities had been found in the plane, its crew or external elements such as bad weather.

The report said investigators are still attempting to extract data from the heavily damaged black box flight data and voice recorders that might offer insight into the plane’s condition and the crew’s actions in the final minutes of the flight.

The U.S. National Transportation Safety Board is helping download information from the flight data recorder and the cockpit voice recorder.

Both black boxes are being analyzed by U.S. experts at a government lab in Washington, D.C.

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