On 11 September 2001, more than 3000 children under the age of 18 lost a parent; some were still in the womb when the towers collapsed.

Ten years on, as the world marks the anniversary, this feature-length documentary gives a voice to some of the young people who lost parents on that fateful day, many speaking out for the first time.

Over the course of a year cameras have followed 11 children from six families across America, charting how one day's events touched children of all ages, religions and backgrounds. Some are only just beginning to comprehend what they lost on that day, while others are entering adulthood and forging their own lives.

Interviewees include Caitlin, who lost her fireman father in the Twin Towers; Rodney, who went off the rails after his mother was killed at the Pentagon; Fahina, whose father was one of 60 innocent Muslims killed on 9/11; and three young sisters - Anna Clare, Madison and Halley - whose dad died on Flight 93.

Their honest recollections of this confusing and catastrophic day, as well as their difficult and inspiring journeys in the years since, offer a moving new perspective on the far-reaching consequences of September 11.

The film interweaves powerful interviews with home movie footage of the families to create a unique and intimate portrait before and after the tragedy.

The children of 9/11 - from those who were in the womb to those on the brink of adulthood - reveal how children come to terms with tragedy and how families confront grief.

From resilience to despair and from strength to anger, their stories are a diverse and fresh insight into the 9/11 story.