Here's a link to the FAA's Emergency Order. At the bottom of page 3 and on to page 4, they state that: "the investigation of the ET302 crash developed new information from the wreckage concerning the aircraft's configuration just after takeoff that, taken together with newly refined data from satellite-based tracking of the aircraft's flight path, indicates some similarities between the ET302 and JT610 accidents that warrant further investigaton of the possibility of a shared cause for the two incidents that needs to be better understood and addressed".