The Denver Post reports that David Lawless is scheduled for sentencing in federal court Thursday.
He faces a minimum of 30 years in prison after pleading guilty to use of a destructive device during a crime of violence.
Authorities say Lawless forced his way into a Borders bookstore and planted two crude bombs fashioned from propane tanks in June 2011. One exploded, causing little damage.
A third propane tank device planted outside the store failed to ignite. According to a plea deal, Lawless also confessed to planting a similar device at a Denver restaurant the day before.
(Copyright 2012 by The Associated Press. All Rights Reserved.)