St. Jospeh police arrest two juveniles and an adult for holding up a pizza delivery driver at knifepoint last weekend. It happened in the 700 block of Concord just after 11:30 last Saturday night. Police say the suspects broke into an empty house then robbed the driver when he showed up. Both St. Joseph juveniles have been turned over to juvenile authorities. The third accused is 23-year-old Loren D. Deming, also from St. Joseph. Deming remains in the Buchanan County jail on a $75,000 bond for second degree robbery.