A group of authorities and volunteers carried out new search for Morgan Hill teenager Sierra LaMar Wednesday, expanding into two new locations.

Since the teen’s disappearance almost a month ago, a $10,000-reward has been offered for information leading to LaMar’s return and more than a thousand tips have filtered in, according to Santa Clara County Sheriff’s deputies.

The dozens who participated in Wednesday morning’s search targeted a quarry south of Gilroy and a shooting range near Morgan Hill, marking anything that was deemed “suspicious” for authorities.

 “When you put this amount of people out there you're bound to find clues,” said Ernest Wheeler of Martinez.

Marc Klaas, whose own daughter Polly was kidnapped and killed nearly 20 years ago, has spearheaded the volunteer searches.

 “We’d be looking for things like shallow graves. We’d be looking under, unfortunately, piles of garbage…. My daughter was found under a pile of garbage," said Klaas.

Deputies said they also started scouring the Chesro and Uvas reservoirs earlier that week because they are so close to LaMar’s mother's house. If sonar images turn up anything, divers would be dispatched there later this week.

“I have hope that she’s alive and well out there,” said Marlene LaMar, Sierra's mother. “I’m not giving up."

But Klaas wasn’t as optimistic Wednesday morning.

“It's ominous at best,” said Klaas. “I'm really concerned about the fate of this young child. Every day that goes by, the more difficult it becomes to remain optimistic.”

Sierra LaMar disappeared March 16th on her way to her school’s local bus stop. Her cellphone, purse and clothes were found nearby her house off Palm and Doughterty avenues days later, but there have been no other traces of her since then.

Wednesday’s search was scheduled to end around 1 p.m. that day. The next volunteer search was expected to proceed that weekend.