Boeing has grounded its entire global fleet of 737 Max aircraft after investigators uncovered new evidence at the scene of the fatal Ethiopian Airlines crash.
The US plane-maker said it would suspend all 371 of the aircraft.
The Federal Aviation Administration said fresh evidence as well as newly refined satellite data prompted the decision to temporarily ban the jets.
The FAA had previously held out while many countries banned the aircraft.
All 157 passengers and crew died in Sunday’s crash. Ethiopian Airlines said on Thursday that the black box flight recorders from the aircraft have been flown to Paris for analysis.
“An Ethiopian delegation led by Accident Investigation Bureau has flown the Flight Data Recorder and Cockpit Voice Recorder to Paris, France for investigation,” the airline wrote on Twitter.
The FAA has a team investigating the disaster at the Ethiopian Airlines crash site working with the National Transportation Safety Board.
Dan Elwell, acting administrator at the FAA, said on Wednesday: “It became clear to all parties that the track of the Ethiopian Airlines [flight] was very close and behaved very similarly to the Lion Air flight.”
President Donald Trump initially announced that the FAA would be making an emergency order following “new information and physical evidence that we’ve received from the site and from other locations and through a couple of other complaints”.
The US and Brazil became the latest countries to suspend the Boeing 737 Max from flying after nations including the UK, China, India and Australia all grounded the aircraft.
Until Wednesday, the FAA position was that a review had showed “no systemic performance issues” and that there was no basis for grounding the aircraft.
Boeing, the US plane manufacturer, said that it “continues to have full confidence in the safety of the 737 Max”.
However, it added that after consultation with the FAA and the National Transportation Safety Board it had decided to ground the flights “out of an abundance of caution and in order to reassure the flying public of the aircraft’s safety”.
Dennis Muilenburg, president, chief executive and chairman of Boeing, said: “We are doing everything we can to understand the cause of the accidents in partnership with the investigators, deploy safety enhancements and help ensure this does not happen again.”
Pilots in the US had complained late last year about problems controlling the Boeing 737 Max 8 during take-off.
They reported difficulties similar to those that contributed to the fatal Lion Air crash in Indonesia in October.
The Ethiopian Airlines plane crashed minutes into its flight.
Flightradar24, an air traffic monitor, said the plane’s “vertical speed was unstable after take-off”.
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