The picture ...

.
... gets clearer:

This one, from the Standard-Examiner is headlined “Suspect had a bomb,” and repeatedly, explicitly refers to a “bomb” that police detonated in Stewart’s closet. Meanwhile, this one, from the Salt Lake Tribune, quotes an ATF spokesman.

The ATF spokesman said that to characterize what was found to be a bomb was inaccurate.

Two stories, two very different conclusions. I urge you to rear the whole article at Radley's.

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