In the meantime, however, Abu Zuhri called on all militant groups to continue firing rockets on Israel "in retaliation for the Israeli massacres."
Israeli missiles also continued to explode in Gaza while sirens sounded in Israel, signalling incoming rocket fire from Gaza.
Hamas said three Palestinian journalists were killed by an Israeli missile today, and Israel said one of its soldiers was killed by a Palestinian rocket today.
Gazans streamed out of northern neighborhoods during the afternoon after the Israel Defense Forces dropped leaflets telling residents to evacuate before dark. Scared Palestinians poured into Gaza City, cars and trucks piled high with belongings, many heading to schools for shelter.
ABC News' Matt Gutman contributed to this report