Ali Harbi Ali: an academic high-flyer who fell into extremism

Ali, whose father was involved in anti-terrorist campaigns, had researched attacks on other MPs

Ali Harbi Ali's descent to extremism followed an otherwise unremarkable childhood.

Born in Southwark, London, in 1996 to Somali parents, Ali grew up in a three-bedroom 1980s terrace house in Croydon with his mother, two sisters and younger brother.