Authorities will expand their search of area reservoirs in their hunt for a missing California girl.

Sierra LaMar, 15, of Morgan Hill, was last seen early March 16 leaving her home to walk to a school bus stop. Investigators say she never made it.  

Underwater searches last week of the Chesbro and Uvas reservoirs came up empty, but police are planning to send dive teams to two other reservoirs later this week, Santa Clara County sheriff’s spokesman Jose Cardoza told the Los Angeles Times.

The Calero and Anderson reservoirs, which have yet to be searched, are located 5 to 10 miles from the girl's home, according to the newspaper.

Authorities also said Monday that test results from a crime lab have yielded new leads in the case, but they declined to reveal the nature of the clues, Fox affiliate KTVU-TV reported.

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The girl's cellphone was recovered shortly after her disappearance about three-quarters of a mile from her home after police tracked its electronic ping. Her Juicy brand bag also was discovered a couple of miles from her home, with a pair of her pants and shirt found neatly folded inside it. 

Cardoza told the station that the new leads relate to "one of those items," but he did not elaborate.

The girl's family, meanwhile, says it hopes the new clues might bring a break in the case.

"I hope something pans out, because we've just been desperate for something," the girl's father, Steve LaMar, told the station.

Sierra, a sophomore at Sobrato High School, lives with her mother and stepfather. She transferred to the school in October after the family moved from Fremont to Morgan Hill.

The girl's father, Steve LaMar, who lives some 40 miles away in Fremont, is a registered sex crimes offender but is not considered a suspect in the case.

Sierra LaMar is described as 5 feet, 2 inches tall with brown hair. She was last seen carrying the Juicy brand pink and black purse.

Anyone with information on the teenager's whereabouts is being urged to call the Santa Clara County Sheriff's Department at 408-299-2311.

Click for more on this story from KTVU.com