"EASA has decided to suspend all flight operations of the two affected models," the agency said.
"Since that action, another fatal accident occurred," EASA said, referring to Sunday's Ethiopian Airlines crash that killed 157 people.
"At this early stage of the investigation, it cannot be excluded that similar causes may have contributed to both events," the agency said.
"Based on all available information, EASA considers that further actions may be necessary to ensure the continued airworthiness of the two affected models.
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