The German weekly Die Zeit reported today some of the sites, known as 'portals,' were located within concentration camps such as Dachau and Sachsenhausen.
    
Gabriele Hammermann, director of the memorial site at Dachau, told the dpa news agency that Google's actions were a humiliation for victims and relatives of the Nazi camps.
    
In a statement, Niantic Labs' founder John Hanke said the company has begun removing the offending sites from the game. He said "we apologise that this has happened."