Israel is facing an Iranian-backed axis of terror. Though the explosive used raises many questions, and Hezbollah might not have directly launched the attack, that doesn't mean Iran wasn't involved. Hamas and PIJ are both backed by Iran, and both groups have increased their activity in the northern West Bank, close to northern Israel. However, this could still be a terrorist attack unrelated to Iran, as a thorough investigation needs to be carried out.
It's unclear if Hezbollah was involved or not, but either way, attacks like this are a symptom of Israel's occupation of Palestine, as well as areas in Lebanon and Syria. Violence is a terrible thing, but the violence of occupation is an everyday occurrence that is far greater than any attack like this.