In a letter to the Home Affairs Select Committee, Theresa May said the £1,716,306 figure includes the terror suspect's legal aid costs of £647,658, as well as more than £1 million in Home Office costs for pursuing the case through the courts.
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A mother feared to have been planning to travel to Syria with her four children has been charged with child abduction.
Dimitri Diatchenko was sentenced to 60 days community service after eating the animal and sending his ex graphic photos of what he did.
The starving toddler has been taken into care following the incident in Chile - but it is thought the dog may well have saved his life.