A little known fact is that the israeli spy ring of 9-11 infamy had demolition experts.

'Furthermore, the Israeli spy corps included not only experts in electronics but also explosives experts. Now the reason for including electronics experts is quite simple — to keep tabs on possible Islamic terrorists and also, it appears, on U.S. government officials. But what possible purposes would demolition men serve? My imagination is impoverished, no doubt, but the only purposes I can think of are blowing things up or providing aid to others interested in blowing things up.'

http://www.thornwalker.com/ditch/towers_5.htm

Remember the explosive traces found in the moving vans

'The police and FBI field agents became very suspicious when they found maps of the city with certain places highlighted, box cutters (the same items that the hijackers supposedly used), $4700 cash stuffed in a sock, and foreign passports. Police also told the Bergen Record that bomb sniffing dogs were brought to the van and that they reacted as if they had smelled explosives. (10)

The FBI seized and developed their photos, one of which shows Sivan Kurzberg flicking a cigarette lighter in front of the smouldering ruins in an apparently celebratory gesture. (11)

The Jerusalem Post later reported that a white van with a bomb was stopped as it approached the George Washington Bridge, but the ethnicity of the suspects was not revealed. Here's what the Jerusalem Post reported on September 12, 2001:

American security services overnight stopped a car bomb on the George Washington Bridge. The van, packed with explosives, was stopped on an approach ramp to the bridge. Authorities suspect the terrorists intended to blow up the main crossing between New Jersey and New York, Army Radio reported. (12)

TCM Breaking News reported that the van was laden down with tonnes of explosives (13).'

http://www.whatreallyhappened.com/fiveisraelis.html