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Boeing’s stock plunged Monday as the list of countries and airlines grounding the Boeing 737 MAX 8 planes continued to grow the day after one crashed in Ethiopia, killing all 157 people on board.

The Ethiopian Airlines jet crashed shortly after it took off from Addis Ababa on Sunday, drawing renewed scrutiny of the plane just four months after a similar crash of the same model that killed 189 people in Indonesia.

Authorities in China, Indonesia and Ethiopia ordered airlines to ground their Boeing 737 MAX 8 planes on Monday. Chicago-based Boeing said it did not intend to issue any new guidance to its customers. It does plan to send a technical team to the crash site to help Ethiopian and U.S. investigators.

Meanwhile, Mexican airline Aeromexico has suspended the operation of six Boeing 737 MAX 8 jets, and it won’t fly them again until they hear more about the investigation into the Ethiopian Airlines crash.

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“Flights operated with these planes will be covered by the rest of the fleet,” the airline said.

Singapore, too, has decided to ground its Boeing 737 MAX 8 fleet, reported The Straits Times.

SilkAir, the regional arm of Singapore Airlines, flies six such planes and will be affected by the suspension, the Times added.

READ MORE: Canadian airlines fly 41 planes of the type that crashed in Ethiopia

The 737 is the bestselling airliner in history, and the MAX, the newest version of it with more fuel-efficient engines, is a central part of Boeing’s strategy to compete with European rival Airbus.

“Safety is our No. 1 priority and we are taking every measure to fully understand all aspects of this accident, working closely with the investigating team and all regulatory authorities involved,” the company said in a statement.

Boeing’s stock fell 7 per cent to $391.80 in afternoon trading.

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2:44 Eighteen Canadians among 157 killed in Ethiopia plane crash Eighteen Canadians among 157 killed in Ethiopia plane crash

A spokesman for Ethiopian Airlines, Asrat Begashaw, said the carrier had grounded its remaining four 737 MAX 8 planes until further notice as an “extra safety precaution.”

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The airline had been using five new 737 MAX 8s and awaiting delivery of 25 more. Asrat said the search for body parts and debris from the crash was continuing.

China’s Civil Aviation Administration said that it ordered airlines to ground all 737 MAX 8 aircraft, in line with the principle of “zero tolerance for security risks.”

READ MORE: China orders its airlines to ground Boeing 737 MAX 8 jets

It said it would issue further notices after consulting with the U.S. Federal Aviation Administration and Boeing.

FAA spokesman Lynn Lunsford would not say whether the agency plans to ground any planes.

“Each action taken by the FAA is based on sound, proven facts,” he said in a statement. “If we have information that affects safety, we take immediate and appropriate action.”

The agency also issued a statement Monday, saying that it would issue a Continued Airworthiness Notification for operators of the 737 MAX 8.

UPDATED #FAA Statement on Ethiopian Airlines Flight 302. pic.twitter.com/QJ0m5eaHHJ — The FAA (@FAANews) March 11, 2019

The Airworthiness Notification itself advised airlines that fly the 737 MAX 8 that the FAA has taken numerous actions since the crash of the Lion Air flight in October.

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Those actions have included “validat[ing] that airplane maintenance and functional check instructions on Angle of Attack (AOA) vane replacement were adequate.”

The notification also advised people of the FAA’s ongoing oversight role with regard to the 737 MAX 8. That role includes overseeing an effort by Boeing to enhance the plane’s flight control system, changes “which provide reduced reliance on procedures associated with required pilot memory items.”

The FAA expects to mandate these design changes no later than April 2019.

The FAA on Sunday said it is in contact with the State Department and plans to join the U.S. National Transportation Safety Board in helping Ethiopian civil aviation authorities investigate the crash.

The statement came as California Sen. Dianne Feinstein called on the FAA to stop flying the 737 MAX 8, saying: “Until the cause of the crash is known and it’s clear that similar risks aren’t present in the domestic fleet, I believe all Boeing 737 MAX 8 series aircraft operating in the United States should be temporarily grounded.”

Chinese carriers and leasing companies operate 96 Boeing 737 8 MAXs, according to the government, with dozens more believed to be on order. China Southern Airlines is one of Boeing’s biggest customers for the aircraft.

Indonesia also grounded 11 737 MAX 8s for inspections to ensure flight safety and that the planes are airworthy, said Director General of Air Transportation Polana B. Pramesti.

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WATCH: Witness says Ethiopian Airlines plane trailed smoke before crash

1:21 Ethiopian Airlines crash: Witness says plane trailed smoke before impact Ethiopian Airlines crash: Witness says plane trailed smoke before impact

India, meanwhile, has seen its aviation watchdog issue safety instructions for flying the planes.

The pilot-in-command has to have at least 1,000 hours of flying experience and the co-pilot 500 hours on new generation Boeing 737 aircraft.

India’s directorate-general of civil aviation has ordered a safety assessment of the MAX 8. Airlines have been asked to ensure compliance by engineering and maintenance personnel.

Cayman Airways also said it was temporarily grounding two Boeing 737 MAX 8 aircraft along with Comair, the operator of British Airways and Kulula flights in South Africa. A statement does not say how many of Comair’s planes are affected.

Wrenelle Stander, executive director of Comair’s airline division, says in the statement that Comair “remains confident in the inherent safety of the aircraft.”

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It’s unusual for authorities to take the step of grounding planes, and it’s up to each country to set standards on which planes can fly and how those planes are maintained, said Todd Curtis, an aviation safety analyst who directs the Airsafe.com Foundation.

READ MORE: Ethiopian Airlines crash — plane’s black box of cockpit recorder, digital flight data found

“If there is a suspicion…that there’s not only something inherently wrong with 737 MAX 8 aircraft, but there are no procedures in place to cure the problem, then yes, they should either ground the plane, or there are several levels of things they could do,” Curtis said.

For example, authorities could require that airlines check certain planes do not have a specific problem before they could fly, or they could require replacing parts or systems before the next flight, Curtis said. The FAA frequently directs airlines to ensure certain corrections are made within a specific timeframe, he said.

The FAA told airlines in November to update the plane’s operating manual with information about the 737 MAX 8′s system that can automatically turn the plane’s nose down and inform pilots how to respond if the system kicks in.

Rescuers work beside the wreckage of an Ethiopian Airlines’ aircraft at the crash site, some 50 km east of Addis Ababa, capital of Ethiopia, on March 10, 2019. Xinhua/ via Getty Images

Real-time flight radar apps showed dozens of the aircraft still operating around the globe.

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The head of Indonesia’s national transport safety agency, Soerjanto Thahjono, offered to aid the Ethiopian investigation into Sunday’s crash.

The NTSB likewise said it was sending a team to help Ethiopian authorities. Boeing and the U.S. investigative agency are also involved in the probe into the Lion Air crash in Indonesia in October.

Like the Ethiopian Airlines crash, which happened minutes after the jet’s takeoff from Addis Ababa, the Lion Air jet that crashed off Indonesia had erratic speed during the few minutes it was in the air.

Safety experts cautioned, however, against drawing too many parallels between the two disasters.

“I do hope though that people will wait for the first results of the investigation instead of jumping to conclusions based on the very little facts that we know so far,” said Harro Ranter, founder of the Aviation Safety Network, which compiles information about accidents worldwide.

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The situation will be better understood after investigators analyze the Ethiopian plane’s black boxes, said William Waldock, an aviation safety professor at Embry-Riddle Aeronautical University. An airline official said Monday that the black box and cockpit voice recorder had been found, but the box was partially damaged.

WATCH: White House expresses condolences to victims of Ethiopian Airlines crash

0:22 White House expresses condolences to victims of Ethiopian Airlines crash White House expresses condolences to victims of Ethiopian Airlines crash

Boeing has delivered about 350 737 MAX planes to scores of airlines and has orders for more than 5,000.

Shares in the company fell 9.6 per cent Monday in pre-market trading.

Alan Diehl, a former National Transportation Safety Board investigator, said reports of large variations in vertical speed during the Ethiopian jetliner’s ascent were “clearly suggesting a potential controllability problem.”

READ MORE: Mother and daughter, climate change activist identified as victims in Ethiopian Airlines crash

Waldock said the way the planes both crashed — a fatal nosedive — was likely to raise suspicion. Boeing will likely look more closely at the flight-management system and automation on the MAX, he said.

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“Investigators are not big believers in coincidence,” he said.

Boeing has delivered about 350 737 MAX planes to scores of airlines and has orders for more than 5,000.

WATCH: Officials survey wreckage of Ethiopian Airlines plane crash

Alan Diehl, a former National Transportation Safety Board investigator, said reports of large variations in vertical speed during the Ethiopian jetliner’s ascent were “clearly suggesting a potential controllability problem.”

Other possible causes include engine problems, pilot error, weight load, sabotage or bird strikes, he said.

Ethiopian has a good reputation and the company’s CEO told reporters no problems were spotted before Sunday’s fight. But investigators also will look into the plane’s maintenance, which may have been an issue in the Lion Air crash.

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Days after the Indonesian accident, Boeing notified airlines that faulty information from a sensor could cause the plane to automatically point the nose down. The automated system kicks in if sensors indicate that a plane is about to lose lift, or go into an aerodynamic stall. Gaining speed by diving can prevent a stall.

READ MORE: Brampton couple remembers 6 family members killed in Ethiopian Airlines crash

The notice reminded pilots of the procedure for handling such a situation, which is to disable the system causing the automatic nose-down movements.

Indonesian investigators are examining whether faulty readings from a sensor might have triggered the automatic nose-down command to the plane, which the Lion Air pilots fought unsuccessfully to overcome.

The Lion Air plane’s flight data recorder showed problems with an airspeed indicator on at least four previous flights, although the airline initially said the problem was fixed.

Boeing chairman and CEO Dennis Muilenburg said in December that the MAX is a safe plane.

—With files from Reuters