Thousands of Israeli troops have made preparations to move into Gaza on one hour’s notice, according reports.
One officer said troops had been ordered to prepare “to the highest state of readiness”.
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.