1993 Bomb Was Planted In Secret Service Parking Area

Everyone knows that the FBI had penetrated the cell which carried out the 1993 World Trade Center bombing, but -- at the last minute -- cancelled the plan to have its FBI infiltrator substitute fake power for real explosives, against the infiltrator's strong wishes (summary version is free; full version is pay-per-view)? See also this TV news report.

I just found another interesting fact about the 1994 bombing. As one of the leading websites for building-related information states:

"The immense blast happened at 12:18 PM local time in the Secret Service's section of the car park underneath and between what are New York's tallest buildings."

Note: Is it possible that the Secret Service -- the premier security agency in the U.S. -- left their cars totally unprotected? If so, that would have been very sloppy security.