NEW It also suggests that police could have been aware of Breivik before the attacks took place , but said there were `` no grounds for contending that the Police Security Service could and should have averted the attacks . '' : The prime minister says he will not hand over the weapon . Police had not trained for a terrorist attack , the investigation found . No one imagined a sole weapon could cause such devastation , the report says . Anders Erik Breivik does not deny killing 77 people in Norway last year .
NEW : The prime minister says he will not hand over the weapon . Police had not trained for a terrorist attack , the investigation found . No one imagined a sole weapon could cause such devastation , the report says . Anders Erik Breivik does not deny killing 77 people in Norway last year .