Ansar Beit al-Maqdis, in a statement posted on a militant website, said that a drone that crossed into Egyptian airspace killed four fighters as they were preparing a cross-border rocket strike into Israel.
It said the dead were from Egyptian Sinai tribes and that the rocket squad's leader escaped.
Egyptian security officials, speaking anonymously yesterday, said that a drone firing from the Israeli side of the border had killed five suspected militants.
Israel has maintained official silence about the strike, suggesting that if the Jewish state was involved, it might be trying to avoid embarrassing the Egyptian military. An Egyptian military spokesman later denied the report but did not provide another cause for the explosion.
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The strike could signal a significant new level of security cooperation between Egypt and Israel following the military coup that ousted Egypt's president, Mohammed Morsi, last month. The military has alleged that Morsi and his Muslim Brotherhood movement had turned a blind eye to Islamic militants in the Sinai.
The Egyptian security officials said the Israeli attack was launched in cooperation with Egyptian authorities, despite Cairo's past insistence that the government would not allow anyone else to use its territories to launch attacks against jihadi groups.
Egypt's military and security forces have long been engaged in a battle against Islamic militants in the northern half of the peninsula. Militants and tribesmen also have been engaged in smuggling and other criminal activity in the area for years.