An Amber Alert issued earlier this morning for a 3-year old boy allegedly abducted by his biological, non-custodial mother and another woman, has been cancelled. State Radio reports the child has been found unharmed.  Police say Nicholas Jimmerson had been abductedfrom a Des Moines home on Wednesday night. The alert was issued at 3:15 a.m. Thursday. He was found just after 5 a.m.  The alert said authorities were looking for 22-year-old Melanie Stout and 25-year-old Amber Johnson.  Police have not provided details yet on the recovery of Nicholas or whether anyone has been arrested in the case.