Columbus authorities say they have no suspects or motives in an arson fire that killed five college students over the weekend. The fire at a house near the Ohio State campus early Sunday killed two Ohio State students and three Ohio University students. Two others are hospitalized. Fire captain Steve Saltsman declined to discuss what evidence investigators have. He says they’ve ruled out a gas leak, barbecue grill or other natural or accidental causes. Saltsman would not say how the fire started because investigators are still waiting for results from lab samples taken from the house. Authorities are offering a 15-thousand dollar reward for information in the case.