Hundreds of people have been searching for her for three days now.

More than 100 people joined the search on October 1 and 2 for a 9-year-old girl who went camping with her family in upstate New York and disappeared, USA Today reports.

Charlotte E. Sena was last seen on the evening of September 30 at Moreau Lake State Park, located 56 km north of Albany. She rode her bike in the park with other children, and then decided to ride one more lap on her own.

According to New York State Police, the girl was last seen wearing an orange Pokemon T-shirt, dark blue pants, black Crocs and a gray bicycle helmet. Her parents raised the alarm when the fourth-grader did not return after 15 minutes, New York Gov. Kathy Hochul said at a briefing Sunday.

“We will leave not one stone, not one branch, not one table, not one hut undisturbed, unexplored in the search for Charlotte,” Hochul said, describing her as a “cheerful” girl who was recently elected class president.

The girl’s mother called 911 after her bike was found around 6:45 p.m. Saturday. After an extensive search, authorities issued an Amber Alert Sunday morning because it was “possible that the girl had been abducted.”

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Police believe the girl is at risk of serious harm or death. The search involved drones, bloodhounds and a boat. The FBI has joined the search for the missing girl.

Anyone with information or information about the child’s whereabouts is asked to call New York State Police at (518) 457-6811 or 911.