From "IDF arrests father of TA suicide bomber," from the [1] Jerusalem Post, with thanks to the Constantinopolitan Irredentist:

Islamic Jihad took responsibility for the bombing on Monday and identified Hammad as the attacker soon after the explosion at the Tel Aviv falafel stand. The group said that this terror attack was the first of 70, Israel Radio reported.

In a video released by the group, Hammad said the bombing was dedicated to the thousands of Palestinian prisoners in Israeli jails. "There are many other bombers on the way," he said.