KCJJ has the most description information about the suspicious package on their Twitter account:
Iowa City Police say a note was left with a suspicious package at Dubuque and Washington Street and they plan on detonating it.KCJJ posted the image above, which describes the bomb squad radio detonating the package. Other than that, I don't know much.
As always, I will post more once I learn more.
Updated on 06/11/13: The big news in this case is that police and FBI investigators have had the opportunity to review the remains of this package and determine that there never was a bomb:
With the assistance from the FBI, officials determined that the suspicious package was not a bomb or incendiary device, and at no time was the safety of the public jeopardized, according to a news release.I remember a recent situation out of Linn County where somebody had left a package of donated clothing or food for people in need (with a noted describing the intent of that particular gift) and that was treated as a suspected bomb. I'm half-wondering if this was something similar. Some vendor left a package behind by mistake or somebody left a box of trash along the curb in hopes that someone else would pick it up.
Then again, we (the general public) have no idea what the note said.