(CBS/AP) NORTH CONWAY, N.H. - Police and family members continue searching for Abigail Hernandez, a North Conway, N.H., girl who went missing October 9. Her mother made an emotional plea Saturday, the girl's 15th birthday, asking the public for help.
The teen was last seen leaving Kennett High School around 2:30 p.m. Wednesday. Police say she made it home but when her mother returned later, Abigail was gone.
Zenya Hernandez, Abigail's mother, said on Saturday, "I want to say please come home. We miss you so badly. We want you back with us."
Local, state and federal agents have searched for Abigail by land, water and air. Police have meticulously combed four square miles on land, scoured parts of the Saco River and paddled over Pudding Pond.
The medical examiner was called twice to the scene on Saturday but neither time was related to Abigail's disappearance: One was for a hiker who died Saturday and another was after the discovery of human bone fragments from several years ago, police said.
Zenya Hernandez asked Abigail's friends to come forward with any information that could help return her safely, including whether there were recent changes in her behavior. She was mindful of the importance of the day: Abigail's 15th birthday.
"We love you and we miss you and happy birthday, Abby," she said.
According to CBS Boston, the FBI tracked Abigail's cell phone activity around the time she went missing. The Union Leader reports the final call on the teen's phone was made near Cranmore Mountain Resort, about two miles from her home.
Officials reportedly said the call was made four hours after the last sighting.
Police are asking the public to remain vigilant. They've handed out posters with photos of the missing girl and have been stopping traffic to spread the word. Billboards carry Abigail's image and the number to call to report tips: 1-800-CALL-FBI.
The FBI is involved and enlisted agents from as far away as Virginia to assist in the search.