Indiana Police to Take Lauren Spierer Investigation to 'Next Lev - Chicago News and Weather | FOX 32 News

Indiana police said Monday they were set to interview so-called "secondary-tier" individuals who may be involved in the disappearance of a college student who has not been seen in more than a week.

Friends, associates, and other individuals who knew 20-year-old Lauren Spierer were going to be interviewed -- beyond the original 10 persons of interest-- in an effort to unearth more information about the Indiana University student's whereabouts.

Bloomington Ind. Police Capt. Joe Qualters said the search was expanding to include helicopter flyovers, video footage enhancement, and searching various waterways – in what he called a "secondary-type search" – as officials were still without any breakthroughs 10 days after her disappearance.

"We are very much in the information-gathering stage," Qualters said.

Although a weekend segment on "America's Most Wanted" generated almost 40 new tips, the new information yielded no results in the hunt for Spierer.

"We're obviously not giving up hope," Spierer's father, Roger, told the press Monday. "We feel as strong today in our pursuit to find her as we did the first day."

Meanwhile, Lee Manning, a missing person expert affiliated with the National Center for Missing and Exploited Children (NCMEC), was set to arrive in the college town, 50 miles south of Indianapolis, to assist in the search, Qualters said.

The private group Texas EquuSearch -- known for its use of sonar equipment and other high-tech capabilities – was also providing assistance.

The Indiana University student was last seen walking alone barefoot from a friend's apartment at around 4:30am local time last Friday.

Spierer's parents have offered a reward of $100,000 for information to find their daughter and her mother, Charlene, announced a noontime effort "Lunch for Lauren," asking locals to take a ten-minute lunch break to search their area for any clues.