According to initial reports, there are casualties. No more details are available.
It seems there is an official (military?) gag order about this incident and journalists are asked to refrain from disseminating the news.
(via חדשות בזמן אמת – 24 שעות ביממה on Facebook and others who may have already deleted their posts)
The IDF spokesperson claims it was a controlled explosion and that there are no casualties.