Israeli aircraft attacked the headquarters of Hamas government buildings in Gaza today, including Prime Minister Ismali Haniya's office, after Israel's Cabinet approved a plan for the army to put 75,000 reserve troops on standby.
Officials in Gaza say that at least 38 Palestinians and three Israelis have died since Israel killed Hamas's military chief on Wednesday.
Rocket fire from Gaza into Israel continued into the early hours of Saturday morning.
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.