Israel Justifies Gaza Strike Amid Ceasefire Violations
Saad led Hamas' military rebuilding in northern Gaza since ceasefire.
Saad was Hamas' second-in-command after Izz ad-Din al-Haddad.
He planned October 7 attack and Jericho Wall plan.
IDF and Shin Bet called him a key terrorist.
Operation justified as response to ceasefire violations near yellow line.
Israel mistakenly announced Saad's capture at Sheba Hospital.
His cohort reshaped Hamas' military structure.