Islamic State and Al-Qaeda are bent on sparking a continued wave of terrorism in Europe and the Middle East over the rest of the summer, an Israeli TV report quoted unnamed Western intelligence sources saying Friday night, hours after a series of terrorist attacks hit three continents and left hundreds dead and injured.

Noting that an Islamic State spokesman, Abu Mohammed al-Adnani, called on Tuesday for Muslims to engage in jihad and become martyrs during the current holy month of Ramadan, the Channel 10 TV report quoted the sources saying that IS and al-Qaeda are both encouraging “lone wolf” attacks and working to orchestrate more sophisticated strikes.

Friday’s attacks — in France, Tunisia, Kuwait and Somalia, as well as ongoing killings in Syria — were likely not coordinated, but underlined Islamist groups’ determined encouragement of terrorism, Israeli commentators said.

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The TV report noted that IS, which claimed responsibility for several of Friday’s attacks, is marking a year since it declared a caliphate last June 29.

Highlighting a specific threat to Israel, the report quoted the intelligence sources warning that IS “intends to carry out major attacks from the Sinai,” across the border with Egypt, and possibly from the Golan Heights, across the border with Syria, where it has a heavy presence.