Egyptian officials say authorities have freed a dual U.S.-Egyptian citizen who had been sentenced to life in prison on charges of financing an anti-government sit-in and spreading "false news."

Mohammed Soltan, the son of a prominent member of the now-outlawed Muslim Brotherhood, was arrested in August 2013 when security forces came looking for his father at his house. His family says they didn't find the father at the time, but arrested him instead. His father, Salah, was detained later.

Mohammed, a 27-year-old Ohio State University graduate and former Barack Obama campaigner, had been on a hunger strike over his detention of more than 14 months.

The officials, who spoke on condition of anonymity because they weren't authorized to brief journalists, say Mohammed boarded a flight for Frankfurt early Saturday.