US commanders in Iraq ignored evidence of torture and often failed to investigate the killing of civilians. These are the major findings from the leak of 400000 secret American military files from the whistleblowing website, WikiLeaks. The data describes widespread brutal torture of detainees by Iraqi troops – with some documents showing American authorities often turned a blind eye. The files also reveal that 66000 civilians were killed in Iraq since the US invaded – even though Washington had denied it kept any such record. The Pentagon’s condemned what is the largest-ever leak of classified documents – saying it will only serve to help America’s enemies.