New York authorities are searching for 9-year-old Charlotte Sena who vanished while biking on a camping trip in a state park

More than 100 people are searching for a 9-year-old girl who went missing while camping with friends and family members Saturday in upstate New York, the governor said.

Charlotte Sena was camping in Moreau Lake State Park with her family and went on a bike ride with close friends around dinner time Saturday evening, New York Gov. Kathy Hochul said in a news conference Sunday.

After biking a couple of loops together, "she just wanted to go around one more time by herself, be that big girl and do it by herself," the governor said.

When Charlotte didn't return roughly 15 minutes later, her parents "knew immediately something was up," and began calling her name. People from other campgrounds soon joined the search, Hochul said.

The girl was last seen around 6:15 p.m. ET riding her bike in one of the park's loops, Lt. Colonel Richard L. Mazzone, of the New York State Police, said in the news conference.

At about 6:45 p.m., her bike was found in the loop, Mazzone said.

Two minutes later, her mother called authorities to report her missing.