Another letter bomb was intercepted by postal security officers Tuesday.
It was the 11th such device found in the mail since Sunday and was detected in the sorting room of the central post office in Tel Aviv.
The authorities issued a second alert, warning Israelis to look out for unusually heavy envelopes arriving from countries from where they do not usually receive mail.
The latest letter bomb was sent from Greece. The earlier ones all came from Cyprus and were contained in similar envelopes.
Police suspect that m re may be on the way to Israel from either of those or other countries.
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