Israel's leader is already retaliating for the deadly attack on a Jerusalem synagogue today that killed three Americans and a Briton.
The attack, carried out by two Palestinians with meat cleavers and a gun, happened in an ultra-Orthodox neighborhood that has a large population of English-speaking immigrants.
The attackers were then killed by police.
Prime Minister Benjamin Netanyahu has ordered the homes of the attackers to be demolished -- along with the homes of Palestinians who carried out several other recent attacks.