After it was found, the area was closed off and security forces arrived to inspect the envelope.
The inspection revealed that it contained no explosives or dangerous substances, and the office returned to normal.
Police said Sunday that it was not an uncommon incident.
However sources at the office said that it may have to be detonated under police supervision.
In September suspicious envelopes were sent to four different embassies in Tel Aviv, including that of Turkey and the US. No injuries were reported.
Yair Altman contributed to this report
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