"Israel strongly condemns the horrific and criminal terrorist attack on the Rawda mosque near El-Arish," said a statement from his office.
"Terrorism will be defeated even more quickly if all countries work against it together."
Egypt was in mourning on Saturday as the death toll from the gun and bomb assault at the mosque in the Sinai Peninsula soared above 300, including children, in the deadliest attack the country has witnessed.
The army said warplanes attacked militant hideouts in the insurgency-wracked North Sinai in retaliation.
IS has not claimed responsibility for the attack, but it is the main suspect as the mosque is associated with followers of the mystical Sufi branch of Sunni Islam whom it has branded heretics.
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