The European Aviation Safety Agency has issued a directive grounding all Boeing 737 Max 8 and 9 model aircraft following two recent deadly crashes.

The grounding applies to all European Union airspace.

The crash in Ethiopia on Sunday came five months after an Indonesian Lion Air jet plunged into the ocean.

EASA said in its emergency airworthiness directive Tuesday that "at this early stage" of the most recent investigation, "it cannot be excluded that similar causes may have contributed to both events."

It adds that "based on all available information, EASA considers that further actions may be necessary to ensure the continued airworthiness of the two affected models."

It says companies may make one noncommercial flight to return their planes to a location where they can be inspected.