New videos have been released of Charlotte Sena, as authorities continue searching for the missing 9-year-old girl after she disappeared in New York's Moreau Lake State Park.
The first undated video shows Sena, who was last seen on Saturday evening, sitting in a car and telling a joke.
"Why was the car embarrassed? He had bad gas," Sena was heard saying in the video. The second video shows Sena sitting on the floor of what appears to be a living room while opening up a present.
The 9-year-old girl was last seen going on a bike ride on Loop A in Moreau Lake State Park ar around 6:15 p.m. on Saturday, authorities say. She was reporting missing at around 6:45 p.m, and the park will be closed until further notice while law enforcement officials investigate.
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Sena, a Saratoga County resident, is 4 feet, 6 inches tall and weighs around 90 pounds. She also has green eyes and blonde hair.
She was last seen wearing an orange tie-dye Pokémon shirt, dark blue pants, black Crocs and a gray bike helmet.
An Amber Alert shared by the National Center for Missing and Exploited Children noted that she was taken "under circumstances that lead police to believe that they are in imminent danger of serious harm and/or death."
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The FBI said on Monday afternoon that they are assisting local law enforcement officers in the search, and said that the situation is still "fluid."
"The FBI is assisting our partners and we have deployed essential resources, such as Victim Specialists," the statement read. "We encourage the public to report any relevant information to local law enforcement.
New York State Police announced on Monday afternoon that the continuous 24-hour search has expanded to over 46 miles and includes multiple state departments, including the New York State Department of Corrections and Community Services. Around 400 certified search and rescue workers are assisting law enforcement officers.
Officials say that they are doing everything they can to find Sena, referencing the 9-year-old's kindness towards others and her "huge heart."
"Charlotte is a bright and adventurous girl who loves to be outside," the state police's statement read. "Charlotte has a huge heart and wants to create a club at her school for kids who don’t have friends. She always put others first."
"Please know that we continue to work around the clock to bring Charlotte home," police added.
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Anyone interested in volunteering for the search is asked to contact rangers@dec.ny.gov and to include their name, credentials and contact information in the email.
Authorities are also searching for more tips and information. Anyone with relevant information is urged to call the New York State Police at 518-457-6811, dial 911 or email crimetip@troopers.ny.gov.
Fox News Digital's Pilar Arias, Stephen Sorace, Chris Eberhart and Michael Ruiz contributed to this report.