Susan and John Graham
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Hannah Graham: Parents' appeal in hunt for Virginia student

The parents of missing Virginia University student Hannah Graham have appealed for help in her search.

Authorities say they want to speak to a man believed to be the last person seen with the 18-year-old.

British-born Hannah was last seen early on September 13 in Charlottesville.

More than a thousand volunteers participated in a weekend search for Graham, whose family moved from England to Virginia when she was five years old.

Speaking to reporters, her parents John and Susan said the search was "every parent's worst nightmare".