I'm going on old recollections here so I may not have this exactly right but, as I recall it, the cyanide was just one aspect of the 1993 attack.
IIRC, the intent of blowing the bomb in the underground parking area was to cause a structural failure that would topple that tower into the other one. Doing that would have taken out both towers almost instantly, allowing almost no possibility of evacuation. Had that attack succeeded, the casualty count would have dwarfed 9/11.
"Few people recognize that the 1993 WTC bombing was a failed WMD attack (cyanide)."
The FBI and the mad bombers
http://www.freerepublic.com/forum/a384fb7be25dc.htm
But, incredibly, the same conclusion can be drawn about the World Trade Center bombing.
According to tapes played at the trial of the "terrorists" in that case, the FBI planted Emad A. Salem to infiltrate an Arab group in New York. His job was to act, again, as an agent provocateur -- inciting violent attacks. It was Salem who convinced the other participants to bomb the World Trade Center. When he was asked to assemble the bomb, he went to the FBI to ask for harmless powder to avoid a catastrophe. The FBI essentially cut him off. To make a long, complicated story short and simple: The FBI spent $3 million of your tax money to blow up the World Trade Center.
And according to telephone records was in frequent contact with people back home in Iraq - think this escaped the notice of Saddam & henchmen?
Jim Fox, head of the FBI in New York at the time, was convinced that WTC 1 was a false flag operation backed by Iraq. But LEO's had to treat it as a criminal investigation under Clinton's Justice Dept. A few perps, a independent mastermind who wanted to bring down the towers - cause he was demented or something.