An inmate accused of attacking a convicted British al-Qaeda activist has had the case against him dropped.
Dhiren Barot plotted mass murder in the UK and US
Eesa (formerly known as Dhiren) Barot needed skin grafts after hot oil and boiling water was allegedly poured over him in Frankland Prison in Durham.
However, an assault charge against Sunderland inmate Gary Moody was dropped on the request of Barot.
Barot, 35, was jailed after admitting conspiracy to murder thousands of people in the UK and US.
He was sentenced last November and told he must serve at least 40 years.
Moody, who is serving life for attacking students, had been charged with wounding and assault occasioning actual bodily harm in connection with the alleged attack on Barot.
A Crown Prosecution Service spokesman said: "The case has been discontinued as there is not enough evidence for a realistic prospect of conviction.
"The Crown Prosecutor dealing with the case considered that there were some gaps in the evidence and that a further statement was required from the injured party.
"The injured party declined to provide a further statement and also stated that he did not wish the prosecution to proceed."