Police arrested 65-year-old Earl Albert Moore Tuesday for allegedly trying to bomb a Colorado shopping mall near Columbine High School.

Authorities believe Moore had been on the run since April 20 when he planted a pipe bomb and two propane tanks at the Southwest Plaza Mall in Littleton, Colo. The bomb failed to detonate.

Moore was taken into custody by the FBI in Boulder and is expected to appear in court Wednesday.

The mall is about two miles from Columbine and the attempted attack coincided with the anniversary of the 1999 school massacre that left 13 people dead.

FBI officials said the two were not likely related, but did not offer other details except that a motive had been found.

Police said Moore had just been released from prison one week before the bomb attempt.  He's had several arrests for possession of dangerous drugs, theft, and possession of burglary tools.

In May 2005, Moore pleaded guilty to robbing a bank for $2,546 and served seven years.