Mourad "Moni" Samaan, 49, took his 2-year-old daughter Madeline Samaan-Fey on Sunday and FBI investigators believe her life might be in jeopardy.
The circumstances of the abduction are particularly concerning, according to FBI officials.
Madeline is 2-foot-8 with brown hair and brown eyes.
Samaan is a U.S. citizen born in Egypt who is 5 feet 6 inches tall with black hair and brown eyes and is believed to be an accomplished Spanish speaker. He is known to drive a green Toyota 4Runner with California license plate No. 3XRM111.
The FBI encourages anyone with information related to this case to call (916) 481-9110.