On Friday, a teenager named Michael Piggin walked free from court when the jury at a second trial failed to reach a verdict. The prosecutors have stated they will not seek a retrial.

You can read more about it in this article which gives further details of the trial and what Michael Piggin was accused of:

...planning to carry out a murderous attack on his former school, a cinema, a mosque and a council office near his home in the Midlands.

Piggin had earlier pleaded guilty to stockpiling weapons, including petrol bombs and component parts of pipe bombs, but consistently denied he intended to carry out an attack.