Beijing — A China Eastern passenger jet carrying 132 people crashed in southern China on Monday, aviation authorities said. China’s state-run media said the crash led to a fire on a mountain and an unknown number of casualties. 

The Boeing 737 flight from Kunming city to the southern hub of Guangzhou “lost airborne contact over Wuzhou” city in the Guangxi region, the Civil Aviation Administration of China (CAAC) said in an online announcement.

“At present, it has been confirmed that this flight has crashed,” the CAAC said, adding that it had activated its emergency response and “dispatched a working group to the scene.” The plane was carrying 123 passengers and 9 flight crew members, the CAAC said. An earlier state media report had said there were 133 people on board.

State broadcaster CCTV reported that the plane crashed in Teng county near Wuzhou and “caused a mountain fire,” citing the provincial emergency management bureau. The crash site was about 150 miles from the destination of Guangzhou, meaning the aircraft had traveled about 500 miles of its journey.

The state-run tabloid news outlet People’s Daily said 117 rescuers were working at the crash site and that 650 more rescuers and firefighters, organized by the Guangxi fire department, were heading to the site. The Guangxi fire service crews were battling to extinguish a blaze on a hillside sparked by the crash, and satellite data from NASA showed a massive fire in the area.  
 
CCTV said China Eastern had established nine separate teams to work on everything from disposal of the wreckage to the crash investigation and passenger family assistance.  

“We are shocked to learn of the China Eastern MU5735 accident,” Chinese President Xi Jinping was quoted as saying by state broadcaster CCTV. He also called for “all efforts” to be taken to rescue any survivors and to find out the “cause of the accident as soon as possible.” 

There was no immediate response from China Eastern or Boeing when the companies were contacted by CBS News on Monday. The airline changed its website to black and white colours on Monday afternoon.

 Flight tracker FlightRadar24 showed no more data for flight MU5735 after 2:22 pm local time, when it had reached Wuzhou. It showed that the plane had sharply dropped from an altitude of 29,100 feet to 3,225 feet in the span of three minutes, before flight information stopped.

The plane was delivered to China Eastern by Boeing in June 2015, according to The Associated Press. The twin-engine, single aisle Boeing 737 is one of the world’s most widely-used passenger jets for short and medium-haul flights. China Eastern operates various versions of the 737, including the 737-800, which crashed on Monday, and the 737 Max, which was grounded worldwide after two fatal crashes. China’s aviation regulator cleared the Max to return to service late last year — the last national regulator to do so in a major travel market.  

After the crash on Monday, the Chinese financial news outlet Yicai, based in the economic hub of Shanghai, reported that China Eastern was going to ground all of its 737-800s pending an investigation, but the airline did not immediately confirm that news. 

The U.S. Federal Aviation Authority told CBS News in a statement on Monday that it was “aware of reports that a China Eastern Airlines Boeing 737-800 plane crashed” in China. The agency said it stood ready to assist in the crash investigation “if asked” to do so by Chinese authorities, along with the National Transportation Safety Board, but it noted that China would take the lead by default. 

One villager told a local news site that the plane involved in the crash had “completely fallen apart” and he had seen nearby forest areas destroyed by a fire caused when the plane crashed onto the mountainside.

Fears for the fate of the jet spread on Monday afternoon as local media reported that China Eastern flight MU5735 had not arrived as planned in Guangzhou after taking off from Kunming shortly after 1:00 pm (0500 GMT).

China had enjoyed an enviable air safety record in recent years in a country criss-crossed by newly built airports and serviced by new airlines established to match the country’s breakneck growth over the last few decades.

A Henan Airlines flight crashed in northeastern Heilongjiang province in 2010, killing at least 42 out of 92 people on board although the final toll was never confirmed.

It was the last Chinese commercial passenger flight crash that caused civilian casualties. The deadliest Chinese commercial flight crash was a China Northwest Airlines crash in 1994 which killed all 160 onboard.

Most of the passengers onboard the Malaysia Airlines Flight MH370, which disappeared in March 2014 en route from Kuala Lumpur to Beijing, were from China.