[Diddle E. Squat]

Ramzi Yousef, one of the convicted 1993 World Trade Center masterminds, told federal agents that he would have used sodium cyanide if he had the money because he wanted to create a deadly gas cloud that would rise into the office towers and kill everyone.

Bingo. Would fit with the mention that high-rise hotels and apartments had been warned to secure access to their ventilation equipment(when the threat level was raised).

[txradioguy]

I was watching something on the History Channel the other night that was talking about the 1993 bombing of the WTC. The report stated that there was a chemical agent inside the van that blew up (Sarin I believe). The reason that it didn't cause any deaths was because the heat of the explosion burned it up.

[angkor]

high-rise hotels and apartments had been warned to secure access to their ventilation equipment(when the threat level was raised).

Until last fall, I lived in a highrise condo building.

Management had been informed about ventilation systems as a means of attack quite some time ago, I believe it was spring of last year.