Jon Venables and Robert Thompson were just 10 years old when they abducted two-year-old James from a UK shopping centre, tortured him, and left his body on a railway line in February 1993.
The crime shocked the world, with Venables and Thompson the youngest in Britain to be charged with murder in the 20th century.
Both boys spent just under eight years in detention and were given new identities on their release in 2001 when they were 18.
New name, new identity
Venables, now 27, has been sent back to jail after the breach, which the British Ministry of Justice refused to detail.
"We can confirm that Jon Venables has been recalled to custody following a breach of licence conditions," a ministry spokeswoman said.
"Offenders on licence are subject to strict conditions; if they breach those conditions they are subject to immediate recall.
"There is a worldwide injunction in place that prohibits any reporting including reporting on the internet, that could identify him or his location."
