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       The stepdaughter of a heavyweight Ultimate Fighting Championship (UFC) fighter has been missing in Alabama for more than a week and a reward of $30,000 has been offered, as authorities suspect foul play in her disappearance.

       Dana White, president of the mixed martial arts fighting league, tweeted a video saying he was offering $25,000 in the case of 19-year-old Aniah Haley Blanchard, who has been missing since Oct. 23. Blanchard is a student at Southern Union State Community College and the stepdaughter of UFC fighter Walt Harris.

       The money by White is in addition to a $5,000 reward offered by the state of Alabama. In a statement, the governor’s office said the money was being offered for information leading to an arrest and conviction in the teen’s disappearance.

       This undated photograph released by police in Auburn, Ala., shows Aniah Haley Blanchard, 19, who is missing. The state of Alabama offered a $5,000 reward for information in her disappearance on Wednesday, Oct. 30, 2019. Authorities say they don't believe the college student went missing on her own. ((Auburn Police Division via AP)

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       Blanchard was last seen a week ago in Auburn, Ala., and police later found her damaged car in Montgomery, about 55 miles away.

       Blanchard's black Honda CR-V was found damaged more than 55 miles from where she was last seen. (Auburn Police Department)

       The vehicle – a black 2017 Honda CR-V – wasn’t damaged before she went missing, police said.

       A video released Monday by police showed Blanchard in a store in Auburn the day she was last seen.

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       Authorities initially said there wasn’t any indication of foul play, but they now say it is possible.

       Aniah Haley Blanchard is the stepdaughter of UFC fighter Walt Harris (pictured at an event earlier this year) (Zuffa LLC via Getty)

       “This is a criminal investigation, obviously we’re approaching it as such,” Lee County District Attorney Brandon Hughes said at a news conference Wednesday. “We do not believe that Aniah would or did go missing on her own volition.”

       The FBI, U.S. Marshal Service, the Department of Homeland Security and other law enforcement agencies have joined the investigation.

       Harris and other relatives have issued pleas for information about her whereabouts. Capt. Lorenza Dorsey, an Auburn police spokesman, said investigators weren't eliminating any possibilities in the search for Blanchard.

       "We're hopeful, but we're extremely concerned because of the amount of time that's now passed," Dorsey said.

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       Anyone with information is asked to call the Auburn Police Division Detective Section at 334-501-3140, the anonymous tip line at 334-246-1391, the 24-hour non-emergency number at 334-501-3100, or their local police.

       The Associated Press contributed to this report.