The tragic events of 9/11 have been used to justify the unending “war on terror”, illegal wars in the Middle East in which millions of innocent people have been maimed, killed and displaced, and the erosion of our traditional freedoms and values. Furthermore, in the name of protecting national security post-9/11, spy agencies across the world have been given sweeping new powers and resources. Their intelligence has been politicised to build a case for the disastrous war in Iraq, they are failing to stop terrorist attacks, and they have colluded in illegal acts of internment, kidnapping and torture. However, many intelligence officers are joining the growing numbers of professionals with various kinds of expertise - including architects, engineers, firefighters, politicians, lawyers, medical professionals, military officers, philosophers, religious leaders, physical scientists, and pilots - who have spoken out about radical discrepancies between the official account of the 9/11 attacks and what they, as independent researchers, have learned. These conclusions demonstrate the urgent need for a new, independent enquiry. We are, therefore, calling for a new, independent investigation of 9/11 that takes account of evidence that has been documented by independent researchers but thus far ignored by governments and the mainstream media. As people who have sought to protect the democratic way of life in our countries by serving in the intelligence community, we urge anyone who has worked in an intelligence agency, military intelligence, intelligence oversight or in the counter-terrorism departments of law enforcement agencies to sign the petition demanding a new, independent enquiry.