German police officers guard a terminal at the airport in Frankfurt, Germany, after security measures were increased after the Belgium attacks the previous day, March 23, 2016. (AP Photo/Michael Probst, File) ** FILE **
Featured Photo Galleries
German police officers guard a terminal at the airport in Frankfurt, Germany, after security measures were increased after the Belgium attacks the previous day, March 23, 2016. (AP Photo/Michael Probst, File) ** FILE **
