Arizona Man Teaching English in Germany Vanishes After Concert

A 22-year-old Arizona man who teaches English overseas has been missing since he attended a concert in Germany last weekend.

Devon Hollahan was last seen at around 3 a.m. Nov. 21 after a concert in Frankfurt, Germany.

He was traveling back to a hostel with a friend, who stopped to ask for directions. When the friend turned back around, Hollahan was gone.

Hollahan's father, Jeff Hollahan, told NBC's "Today" show on Friday that hearing his son had vanished is "every parent's worst nightmare."

Jeff Hollahan plans to travel Sunday from his home in Scottsdale, Ariz., to Germany to help search for his son.

Devon Hollahan had been teaching English in Prague since July.