Israeli President Shimon Peres said his country's "purpose remains peace" and that it is acting "in self-defence".
What would you do if you had 900 missiles aimed at your homes? Would you call it an escalation if your government then tried to stop it?
Today's bombing in Tel Aviv is reminiscent of six years ago and could mark a serious escalation in the conflict.
A truce in Gaza suits all sides but none of the groups seem interested in a long-lasting solution.
A complex system of air defences has been instrumental in protecting Israel's population from incoming rockets.