All 132 people aboard a plane that crashed into a mountain in southern China are dead, officials say

There were no survivors in the plane crash in southern China on March 21.

The deputy director of the Civil Aviation Administration of China made the announcement during a news conference. There were 123 passengers and nine crew members on the plane.

According to data from the flight- tracking website FlightRadar 24, China Eastern Airlines Flight 5735 was traveling from Kunming to Guangzhou when it suddenly plunged into a mountainside.

The data showed that the plane descended from over 29,000 feet in less than an hour. The last recorded data point for the flight was at 2:30 p.m. at an altitude of 3,225 feet.

The cause of the crash has not been determined. An air traffic controller tried to contact the pilots several times when the plane began to plummet out of the sky, but never received a response, according to the Associated Press.

The cockpit voice recorder and flight data recorder are still missing, and workers are still looking for them, according to China Daily. It can take months for investigators to analyze and complete reports on the contents of black boxes.

Hundreds of people wearing white hazmat suits fanning out across the mountainside, using excavators, shovels, and even dogs to dig through the wreck, searching for victims and the second black box.

According to the China Daily, 120 of the people on the plane have been identified. A young family traveling on their first-ever flight to seek surgery for their baby daughter were among the plane's passengers.