The passenger plane flown by China Eastern Airlines crashed in Guangxi, China on Monday, official media said.
The passenger plane was heading to Guangzhou from Kunming and was carrying nine crew members and 123 passengers.
CCTV said the accident involving the China Eastern 737 occurred near the city of Wuzhou in Teng County.
It said rescuers had been dispatched and there was no immediate word on the number of deaths and injuries.
According to official media reports, the accident caused a forest fire.
Aviation Safety Network tweeted, “We are following several unconfirmed reports of a possible accident involving China Eastern Airlines Flight # MU5735 a Boeing 737–89P (B‑1791) en route from Kunming to Guangzhou, China.”
The Civil Aviation Administration of China said in a statement, “CAAC has activated the emergency mechanism and sent a task force to the scene.
The China Eastern flight took off at 1:11 p.m. (05:11 GMT), according to FlightRadar24 data, and was scheduled to land at 3:05 p.m. (0705 GMT).
The flight tracking ended at 2:22 p.m. (0622 GMT) at an altitude of 30,000 feet with a speed of 376 knots.
The plane stopped transmitting data just southwest of the Chinese city of Wuzhou.
The China Eastern Airlines website was then presented in black and white, which airlines do in response to an accident as a sign of respect for the presumed victims.
Chinese President Xi Jinping said he was “shocked” by the accident and called for an investigation into the crash, official media reported.
“We are shocked to learn about the crash of China Eastern MU5735,” he said according to CCTV, while calling for “all efforts” to rescue and find out the “cause of the accident as soon as possible.”
The plane was delivered to China Eastern by Boeing in June 2015 and had been flying for more than six years.
The 737–800 model that crashed Monday has a good safety record and is the predecessor to the 737 MAX model that has been grounded in China for more than three years following fatal accidents in 2018 in Indonesia and 2019 in Ethiopia.
The safety record of the Chinese airline industry has been among the best in the world over the past decade.