“What we saw here was a mass Hannibal. There were many openings in the fence, thousands of people in many different vehicles with hostages and without.”
Amid the confusion, twenty-eight Israeli combat helicopters fired all of the ammunition they were holding, including hundreds of 30 mm explosive shells and Hellfire missiles, during the course of the day.
https://www.youtube.com/watch?v=ICxmHKsRWfI
from the livestream video looks like the entire first two floor plus some of the sidewalk/basement all blew out, that's a significant pressure wave to do that