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.
The crash on Sunday in Addis Ababa killed 157 people.
It was the second fatal Max 8 disaster in five months after one crashed over Indonesia in October, claiming 189 lives.
What has the FAA discovered?
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.”
He added that “the evidence we found on the ground made it even more likely the flight path was very close to Lion Air’s”.
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 is the latest country to suspend the Boeing 737 Max from flying after nations include the UK, the European Union, China, India and Australia all grounded the aircraft.
Up until today, the FAA position was that a review had showed “no systemic performance issues” and that there was no basis for grounding the aircraft.
Earlier on Wednesday, Canada grounded the planes after its transport minister Marc Garneau said he had received new evidence about the crash.
He said that satellite data showed possible similarities between flight patterns of Boeing 737 Max planes operating in Canada and the Ethiopian Airlines plane that crashed.
What has Boeing said?
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.”
Sara Nelson, president of the Association of Flight Attendants-CWA, said: “Lives must come first always. But a brand is at stake as well. And that brand is not just Boeing. It’s America. What America means in international aviation and by extension in the larger world more generally—that we set the standard for safety, competence, and honesty in governance of aviation.
Shares in Boeing ticked higher to $377 each following the announcement.
However, the company’s market value has dropped by nearly $26bn since the crash in Ethiopia at the weekend.