It’s also Israel Independence Day (more or less, it was that evening).
It’s called “the catastrophe” in muslim circles and the terrorists sites was full of calls by Imans to blow up Americans and Jews on that day.
Not to point out the obvious or anything.
Israel Independence Day started at sundown (7:30pm). Israel time is 7 hours ahead, so by Jerusalem time, it was a couple of hours into Israel Independence Day when the bombs went off.