California police are searching the cellphone records of Sierra LaMar, a high school student last seen when she left home on Friday morning.
The phone turned up on the side of the road near Sierra's home, but cops admitted they've found little other evidence related to her disappearance.
The sophomore was last seen around 6 a.m. when she left home for classes. The bus driver handling the route where she usually got picked up said he didn't see her, according to Fox News. Police dogs sniffing for her scent couldn't find it any farther from her home than the end of her driveway, Fox reported.
Her mother learned the teenager was missing when she got a message from the school's automated attendance system at 6 p.m.
To help with the search, police deployed a helicopter over the weekend, but there wasn't much payoff from the air power.
LaMar is 5-feet-2-inches tall and was carrying a black-and-pink Juicy bag when she vanished.
Cops are going through the former cheerleader's cellphone records and laptop for clues, Santa Clara County Sheriff's Office Sgt. Jose Cardoza said, according to the San Jose Mercury News. Her Facebook and Twitter accounts are of interest, because a runaway teen might reveal or hint at their plans.
Her parents don't think their daughter ran away, but police were exploring that possibility.
There's no sign yet of foul play, so police are treating this as a missing person case, ABC News reported.
But still, police widened their investigation. On Monday, they announced they'd interview known sex offenders living in the area, according to the Morgan Hill Times.
LaMar's parents are divorced, but police told ABC that her father and mother have been cooperative. LaMar lives with her mom, while her dad lives in Fremont. LaMar lived in Fremont and was a cheerleader there, before she moved to Morgan Hill in October.
Anyone with information about her whereabouts can call the Sheriff's Office at 408-299-2311 or 408-808-4500, or the anonymous tip line at 408-808-4431.