Acting U.S. Attorney Marietta Parker says 22-year-old Michael A.
Vanlerberg entered his plea Tuesday. The Leawood man was attending the University of Kansas in November 2007 when he caused an explosion that destroyed a mailbox and damaged three nearby vehicles in Lawrence.
Investigators say Vanlerberg was using bombs assembled from parts he ordered over the Internet in his backyard. Investigators say when searching the property they found 54 explosive devices, a camcorder with videotape of the stolen Jayhawk being blown up and other materials for making bombs.