Yusuf Shah, from Ilford, was 16 years old when he was stopped at Heathrow in January 2024.
Detectives found he had been active on social media since 2021, when he was 13 years old, discussing religion.
From the end of 2022, he expressed his support for the activities of terrorist groups such as Al Qaida and Tehrik-e-Taliban.
Shah has been convicted of one count of providing instruction or training and three of collecting terrorist materials.



