The attacks were the deadliest in Norway since World War II , and a survey found that one in four Norwegians knew " someone affected by the attacks " . It is also the fifth deadliest terrestrial terrorist attack in Western Europe behind the Bologna bombing in 1980 , the Nice attack in 2016 , Paris attacks in November 2015 , and the Madrid train bombings in 2004
Paris attacks
November 2015 Paris attacks
2011 Norway attacks