Actions 'not connected to terrorism'published at 17:35 BST
The CPS said Strang told his classmates all he needed to build a bomb was a pressure cooker.
At that point, he had been "testing making explosives", the CPS spokesperson added, and had ingredients capable of making up to 1.3kg of thermite and 320g of gunpowder.
While Strang was described as having a "disturbed mindset", they said his actions were not motivated by or connected to terrorism.

