Egypt's prime minister, Hisham Kandil, is to visit Gaza today with other government officials in a show of support, an Egyptian Cabinet official said. Israel promised the delegation would come to no harm.
An Egyptian government source, speaking on condition of anonymity, said officials accompanying Kandil would explore the possibility of brokering a ceasefire.
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.