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Israel hits Gaza security compound
Repeated air strikes on Gaza have destroyed several targets including a Palestinian security forces compound after Israel threatened to respond to missiles being fired into Sderot.
At least 32 people were injured, including children, when an F-16 fighter jet "decimated" a building used by the Executive Force, Al Jazeera's Nour Odeh said.
About two hours later on Thursday afternoon another missile hit a car killing a senior members of Izz al-Din al-Qassam Brigades, the armed wing of Hamas, the group said.
The group has threatened to renew its suicide bombing campaign in response to the strikes.
Abu Ubaida, the group's spokesman, said: "This is an open war launched against Hamas. All options are open, including martyrdom operations."
At least two Israelis in the town of Sderot were injured by rockets fired by Palestinian groups on Thursday.
Miri Eisen, spokeswoman for the Israeli prime minister, told Al Jazeera: "Israel has been under attack for days, for weeks. The Hamas themselves have already openly said that they support terror.
"Israel restrained itself completely for the last five months when every day there were rocket attacks. Israel will defend our citizens, we will not let the Hamas, we will not let the rocket people, the launchers, this Hamas-led government define the situation."
Israel says that about 70 Qassam rockets have been fired into the southern Israeli town in the past two days.
David Chater, Al Jazeera's correspondent in Jerusalem, said: "The Israeli prime minister is under great pressure to try and stop these rocket barrages ... and Israel has obviously decided to loosen its policy of restraint.
"[The Executive Force] are not completely, exclusively Hamas and also they have not been responsible, as far as we know, for launching any Qassam rockets, that has been in the hands of the military wing of Hamas and Islamic Jihad.