A China Eastern Airlines aircraft on Monday carrying 133 passengers from Kunming to Guangzhou had an "accident" in the region of Guangxi and caused a fire on the mountains, Chinese state television reported.

The jet involved in the accident was a Boeing 737 aircraft and the number of casualties was not immediately known, CCTV said. Rescue teams were dispatched to the scene.

CCTV said a "China Eastern Airlines Boeing 737 plane carrying 133 people has crashed in Teng county, Wuzhou, Guangxi, and caused a mountain fire."

The twin-engine, single aisle Boeing 737 is one of the world’s most popular planes for short and medium-haul flights.

It was not immediately clear which variant of 737 was involved in the accident. China Eastern operates multiple versions of the common aircraft, including the 737-800 and the 737 Max.

The 737 Max version was grounded worldwide after two fatal crashes. China’s aviation regulator cleared that plane to return to service late last year, making the country the last major market to do so.

China Eastern is one of China’s three major air carriers.

Local media reported that China Eastern flight MU5735 had not arrived at its scheduled destination in Guangzhou after it took off from the city of Kunming shortly after 1:00 pm (0500 GMT) Monday, citing airport staff.

The last major incident at China Eastern was in June 2013 when an Embraer SA jet skidded off the runway while landing in Shanghai airport, according to ASN.

In late 2004, a China Eastern jetliner bound for Shanghai crashed in Inner Mongolia, killing 53 people on board and two people on the ground. That was the worst aviation accident in China in 30 months at the time.

Shares of Boeing fell 6.8% to $179.97 in pre-market U.S. trading. Stock in Shanghai-based China Eastern fell as much as 6.4% in late trading in Hong Kong.