Key evidence in the search for missing Indiana University student Lauren Spierer is now in the hands of the FBI. Investigators hope surveillance video of a mysterious car seen in the area where Lauren disappeared could provide crucial clues.

Police specifically said this vehicle is just another piece of the puzzle. They do not know if the vehicle is of any relevance to the case and no one should assume it's a suspect vehicle.

The search entered its 12th day Tuesday with volunteers, friends and family vowing never to give up. They continued to comb the Bloomington area and beyond. They searched by horseback with the help of the national group, Texas EquuSearch. They searched by air with the use of drones, unmanned planes that will give searchers a birds eye view to look for evidence.

During a news conference Tuesday, police said they are still interviewing persons of interest however no one has been identified as a suspect. Police say they have met no resistance in the investigation at this point. So far, Bloomington police have received close to 1,000 tips with at least 350 coming in since a new system was set up on Saturday with assistance from the FBI. Investigators aren't ruling anything out at this point, saying they are still in the information-gathering stage. Bloomington police Sgt. Joe Qualters said there has been a lot of rumor and speculation and they are taking that in and filtering out what is unfounded.

Police did clarify what Lauren Spierer was wearing the night she disappeared: a white V-neck shirt with sleeves to the elbow and a scoop at the bottom on the front and back. The shirt had bell or butterfly sleeves. Material on the shirt may have a distressed look. She was also wearing black leggings with possible silver zippers on them.