NEW: Registered sex offender tried to kidnap Colorado a boy at Black Forest Hills Elementary School in Aurora last Friday. Solomon Galligan, 33, walked onto school property and approached several children on Friday afternoon and tried to grab a boy before leaving the area. It wasn't immediately clear what prompted him to leave the school grounds before officers arrived. He was spotted and arrested right after. Galligan has been charged with one count of attempted kidnapping and is being held in the Arapahoe County Jail on a $25,000 bond.