This image posted on a militant social media account affiliated with the Sinai branch of the Islamic State group on Thursday, July 16, 2015 shows a fireball rising from an Egyptian Navy vessel during a rocket attack claimed by the group, off the strategic peninsula's Mediterranean coast. The claim of responsibility by the Sinai Province of the Islamic State, as the group calls itself, was made in a brief statement posted on Twitter accounts known to be linked to the group. (militant photo via AP) | View photo - Yahoo News

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This image posted on a militant social media account affiliated with the Sinai branch of the Islamic State group on Thursday, July 16, 2015 shows a fireball rising from an Egyptian Navy vessel during a rocket attack claimed by the group, off the strategic peninsula's Mediterranean coast. The claim of responsibility by the Sinai Province of the Islamic State, as the group calls itself, was made in a brief statement posted on Twitter accounts known to be linked to the group. (militant photo via AP)