Sky News: Hammaad Munshi, who was 16 when police found a guide to death and explosives at his home, was convicted at Blackfriars Crown Court. 

The guide contained instructions for making napalm, other high explosives, detonators, grenades and "how to kill".

Co-defendants Aabid Khan and Sultan Muhammad were also found guilty of possessing terror-related documents.

A spokeswoman for the Crown Prosecution Service said afterwards: "I can confirm Munshi is Britain's youngest terrorist."

Munshi, who is now 18, was part of a cell of 'cyber-groomers' that set out to brainwash the vulnerable to kill "non-believers".

The teen's grandfather is Sheikh Yakub Munshi, president of the Islamic Research Institute of Great Britain at the Markazi Mosque, Dewsbury.

Munshi was recruited at 15 by Khan, 23 - who was described as a "key player" in radicalising the impressionable and vulnerable, both in Britian and abroad, with his message of "violent jihad".

The court was told that Khan wanted to help the teen with his wish to go overseas and "fight jihad".

In one internet exchange, the pair discussed how the schoolboy might smuggle a sword through airport security.

Authorities found al Qaeda propaganda and videos promoting "murder and destruction" on Munshi's computer.

Notes on martyrdom were also found under his bed.

More from the Daily Mail (with thanks to Alan).