The additional incentive for public help in solving 14-year-old Amber DuBois' disappearance was requested by Escondido Police Chief Jim Maher.

The teen was last seen walking to school on Feb. 13. Detectives and volunteer searchers have so far turned up no solid leads about what became of the Escondido High freshman, described by her family as studious, well-behaved, with no history of running away.

Surveillance video of an unidentified burgundy-colored pickup truck that pulled into a bus maintenance yard at Amber's school for a few minutes around the time she vanished also produced no suspect information, authorities have said.

This week, the girl's family criticized police for the first time, saying not enough was being done to find her.

"Our daughter is not getting what she needs to be recovered," Amber's father, Moe Dubois, said at a prayer vigil at Escondido High School on Sunday evening.

According to the teen's family, police failed to act quickly on a tip received Aug. 24 from someone who may have seen Amber at a business. The surveillance video from that unnamed business has since been erased.

The family also alleged that law enforcement failed to respond in a timely fashion after tracking dogs brought to the region by the family last month picked up her scent.

In a statement released prior to the vigil, Escondido police Lt. Bob Benton stressed that his agency wanted the public to know that "we continue to have investigators working full time on this case, (including) detectives from the Escondido Police Department, agents from the FBI and employees from the National Center for Missing and Exploited Children, as well as countless many other resources to help find Amber."

Benton described the case as one of the most extensive investigations ever handled by his department.