( CNN ) -- Indiana investigators and the FBI began combing through a western Indiana landfill Tuesday in search of fresh clues to the June disappearance of college student Lauren Spierer . The Bloomington Police Department has isolated a roughly 170,000-cubic-foot patch of garbage at the landfill and may need two weeks to sort through it , the department said in a statement announcing the search . The site holds waste transported from Bloomington , including from bins intersection where the Indiana University student was last seen . `` While working with the company that operates the landfill , Republic Services , waste that was taken from the city on and around the dates of Spierer 's disappearance was identified at the landfill site , '' police said . `` That location within the landfill has remained isolated and secured since that time with no additional waste placed in the identified area . '' The landfill is in Pimento , about 60 miles west of Bloomington and about 10 miles south of Terre Haute . In a statement issued through police , the Spierer family offered investigators their `` sincere thanks and appreciation for their continued support in our efforts to find Lauren . '' Spierer , a 20-year-old sophomore , disappeared early June 2 after leaving a Bloomington sports bar with a male acquaintance . Police said surveillance video from an alley showed them walking toward his building around 3 a.m. Spierer 's keys were later found in that alley , but the petite blonde never made it home . One of her companion 's neighbors reported seeing Spierer leave around 4:30 a.m. , but police said they found no sign of her after the 3 a.m. sighting on any of the surveillance video they viewed from the blocks between the two buildings . In a statement posted on their website over the weekend , Spierer 's parents expressed frustration at the `` deafening silence '' among her friends and acquaintances and pleaded for them to come forward with any information . `` There is no reason to think the people Lauren was last with would n't do everything in their power to help us find her , '' they wrote . `` The silence compounds our frustration , our desperation and our grief in not having found Lauren , '' they added . `` It threatens to be our undoing , but make no mistake , we will never give up . ''
NEW : The missing woman 's parents blast her friends ' `` deafening silence '' Indiana University student Lauren Spierer disappeared in June . A landfill near Terre Haute holds waste from near intersection where she was last seen . Police have said they are looking for a white van that may be linked to the case, but no one has been charged with Lauren`s disappearance.