1. Investigators don’t know what caused the deadly crash of an Ethiopian Airlines flight on Sunday, and probably won’t for at least a few weeks or months. The Boeing 737 Max 8’s “black box” data recorders have been found, but they can take a while to analyze.

Here’s what we do know. The plane plunged six minutes after its takeoff from Addis Ababa, the capital of Ethiopia, after the pilot sent a distress call. Above, rescuers work at the scene of the crash.

The same model of plane crashed off Indonesia in October. Nearly two dozen airlines have now grounded their Boeing 737 Max 8 planes while another dozen are keeping them in operation.