The debit card of missing Brigham Young University senior Camille Cleverley was used a day after her disappearance was reported to police.
A transaction was conducted on Friday with a bank card belonging to Cleverley, according to Provo, Utah, police.
The card was apparently swiped in a store in Provo, said police Capt. Cliff Argyle. But officers hadn't yet figured out whether Cleverley or someone else used her card, according to Capt. Jerry Harper.
More than 20 people who know Cleverley have been interviewed, said Argyle.
Cleverley was reported missing on Thursday by her roommates, according to investigators, and was last seen in the Provo area, where her campus is located. She vanished along with her bike before the holiday weekend and hasn't been heard from since.
The chief of police cautioned against drawing any hasty conclusions, saying detectives hadn't focused on any one theory as to what may have befallen the 22-year-old student.
"Right now I'm saying we just don't know" what happened to Camille, Provo Police Chief Craig Geslison told FOXNews.com on Tuesday. "We really don't have anything specific ... We're just looking at everything at this point in time."
There were plans in place to widen the search for the missing Boise, Idaho, native and orchestrate a larger-scale canvass of the region where she disappeared.
"We're now in the process of working with some groups of volunteers to broaden those (smaller) searches" that have already happened, said Geslison. So far, he said, investigators have combed through Camille Cleverley's apartment, the bike trail she frequented and other areas around campus where she worked and was known to go.
The chief said his department was collaborating with the Utah County sheriff's office in expanding the hunt for Cleverley. A fixed-wing surveillance plane flew over Rock Canyon, where Cleverley was known to spend time, on Tuesday afternoon but found nothing. A group of volunteers with search and rescue dogs also combed the canyon.
Camille's family was holding onto hope that she is still alive.
"I think she's probably hurt somewhere," said Camille's mother Susan Cleverley.
The blond, fair-skinned college student was last seen on Thursday, most likely by a roommate, according to Geslison. Her Schwinn mountain bike is also gone, and she recently lost her cell phone.
"Her bicycle is missing, so we assume that she had taken off on a bike ride," her mom told FOX News. "She had been visiting with us the previous weekend and had left her cell phone at her sister's."
Camille Cleverley would have started classes at Brigham on Tuesday. The university sent out an e-mail alert to students and faculty Tuesday informing them of the disappearance.
"BYU is obviously very concerned and hopeful," spokesman Michael Smart said. "We are taking our lead from Provo police as to how we can support their search efforts. Students have been involved passing out fliers."
Camille was also an employee of the university, according to the chief of police, and hadn't shown up to work in recent days.
"She's a very reliable person," said Susan Cleverley. "She has not been at work for the days that she's been scheduled, and that's very unlike her."
The young woman's boyfriend has been very cooperative in the investigation, according to police and her family.
"He's been very supportive," her mother said.
She added that the family wasn't aware of any reason her daughter might have run off or sought some time alone. Geslison echoed those sentiments, saying he didn't know of any emotional or other problems Camille was having that would cause her to leave suddenly, without a trace, the way she did.
"We're just looking at everything at this point in time," he reiterated.
Camille's family has also been helping in the investigation and they were the ones who notified police of her disappearance — after her roommates apparently contacted them when she didn't come home, according to the chief.
Though numerous tips have poured into the Provo Police Department, no one has called to say they have seen a young woman matching Camille's description, according to the chief. And no one knew of any plans she had to go away for the long holiday weekend.
As far as whether foul play might be involved, the missing student's mother and police both said they didn't have enough information to go on.
"We have no idea," said Susan Cleverley. "(Police) have several diff scenarios that they’re working on. Right now, we’re trying to get a lead on any one of them."
Cleverley lived in an off-campus apartment and had just met her new roommate before she disappeared, her brother David Cleverley said.
"It could be anything from her getting hurt and lost to an abduction. It's been tough," said 24-year-old David Cleverley, a student at Utah State University in Logan. "It's frustrating to try to put it all together because we have nowhere to start. We don't know what she was thinking when she left."
His sister had her contact lenses with her but did not take eye solution or glasses, he said.
On Monday, family and friends posted fliers in the area with Camille's photo and description.
"We hope that this is an overreaction," sister-in-law Staci Cleverley said then. "We want to see her safe, but we have to realize that is not the only option here."
Volunteers searched the city over the weekend and looked along the Provo River Parkway, Cleverley's favorite place to ride her bike.
Provo police also entered her name in a national registry of missing people, Argyle said.
Cleverley is white with strawberry blond hair, blue eyes and fair skin. She's 5 feet 5 inches tall and 110 pounds. Police are asking anyone with any information to call (801) 852-7241 or (801) 852-6210.
The Associated Press contributed to this report.