In the run up to the Shavuot holiday several months ago, the counter-terrorism unit at the Prime Minister's Office issued a recommendation against travelling to Sinai, due to fresh intelligence it had received regarding preparations to carry out attacks. Israel's security agencies have been closely following events in the Sinai Peninsula and also recently upgraded the situation in Sinai to "very sensitive."Haaretz story also has a timeline of terrorist attacks in Egypt (they leave out assassinations, like the murder of Sadat, in which Al-Qaeda's "idea man" Ayman Al-Zawahiri was involved).
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From Haaretz and AP (via NYT). The Haaretz story (since it's an Israeli paper) adds:
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