Hoursafter the Israeli strikes Gaza fighters fired rockets into southernIsrael, heeding to calls by Hamas and other affiliated Palestiniangroups to avenge the attacks, unprecedented in their scale.
At least one Israeli was killed in the rocket fire, Israeli medics said.
Among those killed in Israel's massive offensive was Tawfiq Jabber, the Gaza police chief.
Islam Shahwan, a Hamas police spokesman, said the missiles hit a police graduation ceremony in Gaza City.
The Hamas-run interior ministry said all security compounds in Gaza have been destroyed.
'War crimes'
Mahmoud Abbas, the Palestinian president and leader of Fatah, condemned the "aggression" in Gaza.
Mousa Abu Morzouz, the deputy leader of Hamas, told Al Jazeera:"Until now the aggression didn't stop ... they are targeting all thepolice headquarters and offices.
"We will defend our people, we will retaliate against this aggression ... our military will retaliate."
Marzouz called on the international community to condemn theattacks: "Nobody in this world can accept what happened and the Israeliaggression ... [we expect] the international community to stand agasintthis and say that it is not acceptable."
Mustafa Barghauthi, former Palestinian information minister, said;"This is not an attack on the Hamas. It's an attack on the wholepopulation and the free will of the people of Gaza."
He accused Israel of committing "war crimes" and demanded that Abbas and his government stop all relations with Israel.
'Only just beginning'
The Israel army released a statement saying "terrorist installations" were hit and that all Israeli pilots returned unharmed.
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| Palestinian officials called on the international community to condemn the raids [AFP] |
The operation against the Hamas is "only just beginning," Avi Benayahu, an Israeli military spokesman said.The air raids follow the decision by the Israeli security cabinet toincrease reprisals for cross-border rocket attacks against Israel, andthe breakdown of a six-month-old Israel-Hamas truce earlier this month.
Hamas ended the ceasefire saying that Israel had violated the trucethe truce by preventing vital food and medical supplies into the GazaStrip.
Ayman Mohyeldin, Al Jazeera's correspondent in Gaza, said: "A series of explosions were heard over Gaza City.
"From where we are there are at least seven different clouds of smoke from the strikes.
"We are seeing some casualties being evacuated in cars."
Egypt has opened the Rafah border crossing with the Gaza Strip toreceive injured people, Egyptian officials said. Ambulances have beendispatched to the crossing and two Egyptian hospitals emptied to takecasualties.
Mohyeldin said that Hamas, who rule the Gaza Strip, was being heldresponsible by Israel for any attacks from the territory into Israel,even if they are undertaken by other Palestinian factions.
Jacky Rowland, Al Jazeera's correspondent in Jerusalem, saidthat Israel's decision to strike at this moment was down to Hamaswithdrawing from the ceasefire and the intensified rocket fire comingfrom the Gaza Strip in recent days.
"In one day [in the past week] we saw 80 rockets ... which is a huge upsurge," she said.