I don't know anything about the situation in Patterson NJ you mention.
I was discussing the Israeli tourist/movers who were observed cheering the catastrophe from three locations in NJ. Some early reports sounded like they were viewing the initial collision. The FBI thought they were possibly part of the plot and spent a lot of manpower tracking them down. They were reported as 'Middle Easterners' in the press.
(As a curious side note, bomb-sniffing dogs reacted to the vehicle in which they were apprehended while no explosives were found.)
"Whatever came of these 'suspicious Israelis'? Was it ever established that they were indeed terrorists or spies?"
Officially these guys were tourists and were deported after a while. As I mentioned in 156, the Forward recently published a claim that the FBI concluded the moving company was a front and they were spies.
There were two other tourist/movers apprehended later in an unrelated incident that I mentioned but the only press coverage AFAIK was the initial article in a small town paper.