State Police are still trying to identify the person who threw a rock at a car on I-5 injuring two University of Oregon students who were driving home to California last month.  Lieutenant Gregg Hastings says the families of Molly Grabill, 20, and Chris Brewer, 19,  have added money to the reward. The rock hit Grabill in the face causing serious injuries.  She was driving and lost control of the car.  Brewer tried to grab the wheel, but the car rolled over.  They have both been released from the hospital.  Hastings says they got a few tips from the original reward.  They’re hoping to larger reward will generate more leads.