Israeli planes bombed targets in the Gaza Strip early on Friday, the heaviest raids in more than a year.
The Israelis say they targeted weapons factories and arms supplies belonging to the Palestinian Islamist group Hamas which controls Gaza.
No-one was killed in the raids, which Hamas say destroyed metal workshops, farms and a cheese factory.
Some sort of attack had been widely expected after two Israeli soldiers were killed last week in Gaza during clashes with Palestinian militants.
At least four of the air strikes were in the southern town of Khan Younis, close to where the Israeli soldiers were killed.
The leader of the Hamas administration in the Gaza Strip, Ismail Haniya, has called on the international community to intervene to help avoid an escalation of violence there.
Mr Haniya said his movement was contacting other Palestinian factions to discuss better protection for Palestinian people.
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