(Portland, OR)  --  Crime Stoppers is offering a 25-hundred dollar reward for information that leads to an arrest in Saturday morning's mass shooting in downtown Portland that killed one person and injured six others.  Police say 18-year-old Makayla Harris died at a hospital from her injuries.  Police say several people left the scene before officers arrived, and they need to talk with them.  Any tip to Crime Stoppers that results in an arrest in the case is eligible for the reward.