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SALT LAKE CITY (AP) -- Federal prosecutors say an Illinois man standing trial in the bombing of a downtown Salt Lake City library was seeking revenge for the arrest of his son on a driving under the influence charge.
![Thomas Zajac](https://img.ksl.com/slc/2452/245248/24524830.jpg?filter=kslv2/inline_lg)
In opening statements Thursday, prosecutors said Thomas Zajac was angry about the 2004 arrest of Adam Zajac by Salt Lake City police.
Thomas Zajac faces multiple charges in the Sept. 15, 2006, explosion that knocked out a library window and forced 400 people to flee. No one was injured.
Zajac was later arrested in Downers Grove, Ill.
Investigators found his fingerprint on a sticker on a piece of cardboard attached to the bomb, and matched it with a prints on file in Ohio and Illinois.
His lawyer says the prosecution is out of proportion with the alleged crime.
(Copyright 2010 by The Associated Press. All Rights Reserved.)