An attempted burglary Thursday at Jim Powell Diamonds in the 2700 block of North 48th Street.  Police have two juveniles in custody. Officer Katie Flood says the owner was working late and heard banging on the north door, sounding like someone was trying to get inside.  Officers showed up and found the teens, who then ran off.  Flood says 18-year-old Cole Boeckman was arrested in the parking lot of Huntington School, while his 14-year-old accomplice was captured about a block away.  A pry bar and a hammer were recovered.