[jennyp]

The Chicago Tribune has apparently a later story, which said this:

The explosion occurred about 9:15 a.m. when something ignited a propane tank or a container of primer used to seal concrete in an above-ground construction area outside the administrative offices of the plant, 1000 E. Ohio St., officials said.

Officials previously attributed the blast to a propane tank in a below-ground construction area but subsequently revised their information and said they were not sure if the tank or the sealant was to blame.

[JustPiper]

Thanx for finding the article Jenny

"said they were not sure if the tank or the sealant was to blame. "

But one always has doubts about exactly what the public is allowed to know. Come from the clinton Stepford mentality.

[AmericanInTokyo]

Cmon now. These are all just random, isolated acts of terrorism. ;-)