The judge said the police had never seen images of worse child absue
A man found with images of "the worst child abuse ever seen" has been jailed for an indefinite period.
Arthur Morley's collection of pictures and videos included newborn babies being raped and abused by adults.
Morley, 64, from Greenford, Middlesex, pleaded guilty to 50 counts of distributing, making and possessing hundreds of indecent child images.
He would serve a minimum of two years before being considered for parole, Southwark Crown Court heard.
"Not only do these depict horrific images of sexual abuse but they also contain the sound of pain that the babies had to endure," said Judge Peter Testar.
"The emotional and physical damage these victims have had to endure at such a young age is immeasurable."
Jurors were told the images originated from eastern Europe and North America in the past five to 10 years.
Morley had previous convictions for rape, attempted rape and indecent assault - all against children - and was a registered sex offender.
The court heard he used a false name, a false address and an internet cafe to avoid detection.
Morley was caught after police arrested another internet paedophile whose computer showed he had been in regular contact with other paedophiles.
When police searched him, they found a "secret compartment" in his coat pocket containing a memory stick used to store some of the indecent images.
A similar storage device and a laptop hard drive were then found hidden in yet more "secret compartments" in his car dashboard.
A total of 2,573 still images were recovered, along with 67 videos.
"The images in this case are in the experience of New Scotland Yard's Paedophile Unit and the Crown Prosecution Service of quite the worst child abuse ever seen, the judge said.
Morley was told he would also remain on the sex offenders' register for life.