I don't think it matters if the hostages have been hostages before...it is not essential to the point.
The essential point is credibility. When you stray out of the mainstream sources, credibility is everything.
As for the Israeli warning, we know that no Jews perished in the 9/11 Twin Towers explosions and controlled demolition, even though everyone knows how many Jews live in New York City.
And a financial building? Come on! That would be like a bomb going off at an Oktoberfest without a person of German heritage getting harmed! Or a basketball stadium collapsing without... oh well, you get the idea.
The list of victims is readily available. There is enough hate going around to motivate one going through that list and demonstrate that none where Jews.
Of course, the exercise has been done, the best estimates are of 400 Jews (in-line with New York's demographics) In addition, depending on how you define citizenship, 1 to 5 where Israelie proper.
Unless you can demonstrate that none on the list of confirmed victims
are Jewish your statement is calomnious and dangerously haineous.
But the Israeli warning is only ONE SMALL CLUE in the massive list of clues that an Iran attack is imminent.
Maybe, maybe not,
It is true, Israel has issued warnings of possible attack against it's interest. This does not mean that it's in relation to an upcoming attack.
This winter, Mossad may have assasinated a prominant Iranian nuclear scientist, allthough this was publicly deamed radiation poisoning. It was most likely the expected retaliation from MOIS (Iranian Ministry of Intelligence and Security) that prompted the warning.
That retaliation may have occured allready, in what is treated as a suicide, the death of David Dahan, head of the Israeli Defense Ministry Mission to Europe was an assasination according to some Intelligence.Slight edits.