On Monday, Bloomington Police said that foul play is suspected in the disappearance of Indiana University student Lauren Spierer. Police did not provided any details, or give any reason as to why they suspect foul play at this time.

"It is not impossible that she has left on her own and gone somewhere, but at this point we feel it is unlikely," said Lt. Bill Parker of the Bloomington Police Department. "We feel there has been some sort of foul play."

Family, friends and even strangers joined in the search Monday morning for Spierer. The 20-year-old was last seen early Friday morning, walking south on College Avenue from 11th Street towards her apartment building at Smallwood, which is located near 8th and College.

Spierer's cell phone and shoes were recovered from Kilroy's, a local bar in Bloomington where they have a sand pit (hence the reason she may not have been wearing shoes). Her ID was found at her apartment and her roommate turned it over to police.

Lauren is described as approximately four feet, 11 inches tall with a slender build. She has blue eyes and blonde hair, longer than shoulder length. Anyone with information should call Bloomington police at 812-339-4477.

Lauren's mother and father traveled from New York to join in the search for their daughter. Spierer's mother said Lauren has a life-threatening heart condition called Long QT Syndrome. Her mother has asked if anyone knows where Lauren is, to please take her to a hospital.

Volunteers resumed their search Monday morning at Lauren's apartment building. Several groups of volunteers met up at the Smallwood apartment building at different times throughout the day before going out into Bloomington area looking for Lauren.

The father of Jill Behrman was there Monday as well, offering support to the family. Jill Behrman was another IU student who went missing 11 years ago. Behrman knows first-hand what Lauren's parents are going through.

Police have assigned an officer to help coordinate the volunteer search efforts from here on. Every volunteer will be required to sign in so police will have a public record of who was there and when. Lauren's parents will be meeting with police every day now. Detectives said they have spoken with 10 persons of interest so far, none of whom are considered suspects.

More information on the search for Lauren Spierer

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Teachers, students and parents at Edgemont High School in Scarsdale, where Spierer graduated two years ago, were shaken to hear she's missing.

"It's every parent's worst nightmare," said Jim Doukas. "I have a daughter who's graduating and she's going to college this year. You dread that phone call. It's horrifying."

The Superintendent of Schools for the Edgemont-Union Free District, Nancy Taddiken, choked back tears as she talked to reporters at the local high school.

"I knew Lauren as a student who distinguished herself, who was highly motivated, who displayed a great deal of intellectual curiosity," Taddiken told Fox59's sister station, WPIX 11.

She said Spierer had participated in a "student exchange" program in Japan and is a wonderful artist.

"She's a little fashionista," Taddiken said.

Spierer was even voted "Best Dressed" in her 2009 Senior Class at Edgemont High School.

Her family's neighbor on Lynwood Road in Scarsdale, Warren Weil, was stunned to learn she was missing. He told us Spierer's father, Robert, is an accountant and her mother, a social worker. The couple has two daughters. Weil remarked to PIX 11, "Young kids really have to watch out. I don't think they realize the threats around them."