The warning signs

Missed chances to prevent attack

October 2015

Ahmed Hassan arrives in the UK on the back of a lorry via the Channel tunnel. He told police he was 16 and had travelled from Iraq

January 2016

Immigration interview with Home Office officials when he says he was trained to kill by Islamic State of Iraq and the Levant (Isil)

2016

While staying at a Barnado’s home, he was seen watching an Isil video and listening to a song in Arabic described as a “call to arms”

April 2016

Starts college course, later telling mentor it was his “duty to hate Britain”

Summer 2016

At college, he was listening to “nasheeds” (works of vocal music) that encouraged violent military action in support of Islam, a memory stick recovered by police later revealed

Later in 2016

Foster parents express “significant concerns” about his mental state and urge social workers to make contact