On Sunday,a plane carrying 157 people struggled to ascend at a stable speed. The pilot sent out a distress call and was cleared to return to the airport, but the plane lost contact with control six minutes after. The jetliner went plummeting down, crashing in Addis Ababa and killing every single person on board.

This is not the first time that this particular airplane has had a problem with their flight. In October, the same Boeing Model went down in Indonesia, killing 189 people. News articles say that there were technical problems with the jet in Indonesia, but say they are still not completely sure. Three countries — Ethiopia, China, and Indonesia — grounded all Boeing 737 Max 8 jets on Monday, a day after the Ethiopian Airline flight bound for Kenya crashed Sunday.

They are putting a hold on flying them because of safety concerns.

“At this stage, we cannot rule out anything,” said Tewolde GebreMariam, the chief executive of Ethiopian Airlines, which has a solid reputation for safety among aviation experts and is in the midst of a major expansion as part of its effort to make air travel easier across Africa.

The crash in Addis Ababa had passengers from about 30 countries. Eight people on that plane were from the U.S. Addis Ababa and Nairobi are home to United Nations offices. But the flight between the cities may have been carrying a particularly high number of United Nations workers because it was the day before a session of the United Nations Environment Assembly, described as the world’s highest-level decision-making body on the environment. The event  brings together representatives from United Nations member states to address environmental problems. When the meeting is held, people will be there with open arms to comfort those who have suffered a loss in this flight.