Of course, all of that didn’t happen overnight.

To fire as many munitions as it did on Saturday in such a short period means Hamas must have been building up its arsenal, both by smuggling and manufacturing, over the long haul, said Aaron Pilkington, a US Air Force analyst on Middle East affairs and PhD candidate at the University of Denver.

Baraka, the Hamas official in Lebanon, said the militant group had been preparing last weekend’s attack for two years.

He made no mention of any outside involvement in the planning of the attack, saying in the Russian media report only that the allies of Hamas “support us with weapons and money. First and foremost, it is Iran that gives us money and weapons.”

The analysts also say the size and scope of Hamas’ raids on Israel caught them – as well as Israeli and other countries intelligence services – off guard.

“It is important to remember that firing off a bunch of rockets is actually very uncomplicated,” Pilkington said.

“What is surprising, … is how you could set stockpile, move, set up, and fire thousands of rockets all while eluding Israeli, Egyptian, Saudi intelligence, etc. It is difficult to see how Palestinian militants could have done this without … Iranian guidance.”

CNN’s Tamara Qiblawi and Jen Deaton contributed to this report.