Police have released an image of Mohammed Hussein as they continue to hunt for his killer.
A post-mortem at Haringey Mortuary gave his cause of death as a single shotgun would to his chest.
More top news
Hundreds of passengers were ordered to leave the terminal building and flights grounded after passengers suffered difficulties breathing.
Council leaders today called on the government to provide extra money to help resettle the youngsters in the capital.
An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."