JERUSALEM (AP) – A hacker network that claims to be based in Saudi Arabia paralyzed the websites of Israel’s stock exchange and national airline on Monday, escalating an international cyber war that has jolted this security-obsessed country.

Neither website contains sensitive information and trading and flights were not affected. But the ongoing salvos by hackers who use anti-Israel language in their posts has revealed how vulnerable Israel is to cyber warfare, despite its sophisticated computer security units in the military and advanced high-tech sector.

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