Mikaela Lynch, 9, disappeared from her family's vacation home in Clearlake Sunday afternoon and city police Chief Craig Clausen said 70-100 volunteers from area law enforcement offices and civilians were combing the area for the San Francisco girl, the Lake County News reported.
Clausen said the brief video clip from a surveillance camera at a neighboring vacation home showed the girl running north down Harbor Drive about 1:30 p.m. Sunday.
"Now we have a last known direction," he said, calling it an "absolutely positive" development that led to search efforts being refocused.
Clausen said she had a habit of taking off her clothing and the video showed her unclothed, the newspaper said. Her family said she had been clothed when last seen playing in the yard but her clothing and a diaper she was believed to have been wearing were found after she disappeared.
Clausen said it appeared Mikaela, described as being 4 feet tall, weighing 70 pounds and having brown hair and blue eyes, wandered away on her own with investigators finding no evidence of an abduction.