Israeli art students dancing on vans.

You probably already know this, but you're mixing a few facts into one here. For anyone out there who isn't familiar with the topic, read on...

The israeli "art students" were in the building for weeks prior to the attack, presumably rigging explosives, as shown in the photos they posted of themselves in front of boxes of blasting caps (or fuse boxes).

The dancing israelis were mossad operatives posing as employees of "Urban Moving Company", which incidentally, went out of business on 9/11/01, and were filmed dancing and flicking lighters while taking photos of the collapsing towers. When arrested, they immediately blamed the attacks on palestinians. Later, 3 of them appeared on israeli television and admitted that they were there to document the event.

The Urban Moving guys drove a van, obviously. But there was also a van with a depiction of an airplane crashing into the twin towers painted on the side of it, which was seen in Manhattan on 9/11. As far as I know, there is not much information about that other than a few frames of blurry video.