UPDATE (4pm): Both rides are back to normal operations. Original story below.
Yesterday marked the first day of daily operations where Flight of Passage and Na’vi River Journey experienced full evacuations. Well, reports are coming in from Twitter of another evacuation this morning.
— ??PixieDust.be?? (@Pixiedust_be) June 9, 2017
Both attractions are currently listed as closed on the My Disney Experience app. Yesterday, Disney said the issue was a fire alarm sensor being activated. Presumably both attractions are impacted by the same issue today.
We will update the story as more details become available.