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Israel Defense Forces

Israel worries about threat from Islamic State

Israel worries about threat from Islamic State

Well before the latest threat from Islamic State, Israel’s military had stepped up intelligence and preparedness efforts with the militant group in mind.

In particular, Israeli forces are keeping an eye on Islamic State's branch in Egypt's lawless Sinai Peninsula, possibly the organization's most effective branch in the region, observers say. Sooner or later, Israel believes, Islamic State could attempt some kind of strike on the country.

Islamic State's leader, Abu Bakr al-Baghdadi, delivered a lengthy address Saturday in which he directly threatened Israel -- and seemed to be answering critics in Islamist militant circles who have complained that the group, based in...