Bjørn Ihler , a survivor of Norwegian far-right extremist Anders Behring Breivik 's terror attacks in 2011 , wrote in '' The Guardian '' that in 2013 , Pettersson had " liked " a YouTube video of former Ku Klux Klan leader Johnny Lee Clary testifying how a positive experience with a black man had caused him to disavow his previously-held beliefs
terror attacks in 2011
2011 Norway attacks
Trollhättan school attack