All of the white vans were working for the ostensible moving company Urban Moving Systems under direction of Dominic Suter, an Israeli Spy who immediately fled to Israel after the attacks.
It was confirmed by two former CIA officers that this Israeli moving company was a front operation for the Mossad. The two CIA sources noted that movers vans are a common intelligence cover.
The Israelis were held in custody for 71 days before being quietly released.