The family of Lauren Spierer has boosted the reward for information leading to their daughter to $250,000.The 21-year-old Indiana University student was last seen walking in Bloomington in the early-morning hours of June 3 after a night of partying with friends. Special Section: Lauren Spierer In a statement on the family's website, Rob and Charlene Spierer said the increase is the result of an "extremely generous donation.""Anyone with information that leads us to our daughter, will be eligible to receive the reward," the statement reads."We remain dedicated to finding our daughter," the statement read. "We offer our sincere thanks for any information you can provide."Private investigator Beau Dietl said he hopes the reward will encourage someone to come forward with a tip, RTV6's Stacia Matthews reported."If you find somebody's body, you can bury it and have closure. But that's the thing; in your mind, you don't know where that little girl is. I really appeal to everyone out there, Dietl said."Everything is a big deal. It may mean the world to us, Charlene Spierer said.To date, Bloomington police have named four persons of interest, but they haven't made any arrests.Some Indiana University students said they hoped for a speedy crack in the case.It's a little calmer on campus. It hasn't been talked about a lot, but I'd hope people come up and start talking about what they know, senior Alex Ottenheimer said.IU professor William Thompson said he doesnt think the money will encourage anyone to come forward."There doesn't seem to be a question of monetary value (as an incentive) to getting the information they are seeking. I wish them luck, but it doesn't seem to change the situation, Thompson said.The family asked people with information to contact their private investigator, Beau Dietl Associates, at 800-777-9366 or the Bloomington Police Department at 812-339-4477.