Police say they’re working through the weekend to strengthen the case against a man accused of starting the fire that killed five college students near the Ohio State University campus. Prosecutors have until Monday to decide whether to seek an indictment against Robert Lucky Patterson. Franklin County Prosecutor Ron O’Brien has said he was considering dropping charges. He says he had questions about the case after reviewing a videotaped police interview with Patterson and five witnesses. Deputy Police Chief Antone Lanata says he hopes that the prosecution proceeds. He says that arson is one of the tougher crimes to prove.