Jeremy Bamber, who murdered five of his family members, and two other killers were told their whole-life tariffs amounted to a breach of human rights.
The European Court of Human Rights said whole-life sentences were "inhuman and degrading".
ITV News deputy political editor Chris Ship reports:
More top news
Cincinnati Zoo's director stood by the decision to shoot dead a 17-year-old gorilla after a toddler accidentally entered his sanctuary.
A total of 8,648 sailors died during the largest naval engagement during the First World War, which marks its centenary on Tuesday.
The figures by the Global Slavery Index are a third higher than previously thought.