Rhys Jones killer put in isolation after stabbing Jake Fahri

Sean Mercer, 18, shot 11-year-old Rhys Jones, in 2007 as Jones was walking home from football practice.

Fahri killed school boy Jimmy Mizen during a fight in which Mizen’s neck artery was cut by a glass dish in a bakery.

Both cases gained national attention and were among a string of high profile murders of young people by young people in 2007-08.

In an incident at Moorland prison in Doncaster on Monday, Mercer attacked and stabbed Fahri, reportedly with a pair of sharpened tweezers, as he was held down by a third prisoner.

Following the attack Fahri was taken to hospital for treatment while Mercer was put in isolation.