Israeli Prime Minister Benjamin Netanyahu has claimed that the ability of the Hamas rebels in Gaza has been pushed back years due to nine consecutive days of Israeli bombings.
Israel has continued to act despite calls from the international community for a ceasefire.
Two foreign agricultural workers were killed when Palestinian rebels fired rockets into southern Israel on Tuesday.
Israel continues air strikes on Gaza At least three Palestinians have been killed in clashes with Israeli police during a protest near Ramallah in the West Bank.
Diplomatic initiatives to bring about a ceasefire have not been successful. France, along with Egypt and Jordan, has submitted a draft ceasefire proposal to the UN Security Council.
Israel opened the border for a few days on Tuesday to allow aid supplies to reach Gaza.
But the border has been closed again after Palestinian rebels fired rockets and mortars. According to Prime Minister Netanyahu, the Hamas group, which controls Gaza, has been hitting unexpectedly.
He said action would continue until peace was restored for all Israelis.
At least 215 people, including 100 women and children, have been killed in Gaza so far, according to the health ministry.
Twelve people, including two children, have been killed in Israel. According to Israel, 150 of those killed in Gaza are rebels. Hamas does not provide casualty figures.
Many Palestinians in the West Bank and East Jerusalem have joined a general strike in protest of Israeli bombings in Gaza.
The strike also affected areas of Haifa inside Israel, which is predominantly occupied by the Israeli Arab community. Public services, schools and many businesses remained closed. There were clashes in many places.