Israel urges the great member nations of the UN to pay no attention to the latests "developments" following the FBI's investigation.
First of all, Israel wishes to applaud the FBI for undertaking such a task, and recognises it is merely trying to do its job. Israel does, however, feel that the FBI is skipping corners when it comes to investigation. Just because a car was seen travelling from one place to another, it doesn't mean there was any transfer of cargo - and besides, the car would have had to have been searched at (at least) one of the three aforementioned buildings
In addition, let us not instantly assume that the nitrogen based fertilizers means that the Iranians provided the bomb - perhaps there is a new agricultural scheme?
Israel would also like to know how the car was seen going from one place to another. You seem to have narrowed this down solely to Israel, but are forgetting that any other country could be involved - Israel urges you to check CCTC footage (or such like) and see if there are other cars acting suspiciously.
Surely there may also be people within the FBI who have a natural dislike of Israel and Iran? It would not be hard to fix "evidence" so that the blame lay with us.
Finally, Israel requests this "source" be removed from its post. If it cannot be trusted to keep things quiet, it could endanger national security in the future. Whilst it may appear Israel is trying to remove a mole to protect itself here, Israel feels strongly that it will only benefit the US.