BBC News -Technology

1. Four arrested in connection with M&S and Co-op cyber-attacks

   Three men and one woman - aged between 17 and 20 - have been arrested in London and the Midlands.

2. Musk says Grok chatbot was 'manipulated' into praising Hitler

   Anti-hate campaigners say the posts were "irresponsible, dangerous and antisemitic."

3. Linda Yaccarino departs as boss of Musk's X

   Her exit comes at a difficult time for Musk who, in a brief reply, thanked her for her "contributions."

4. Nvidia becomes world's first $4tn company

   Shares in the chip-maker have surged in value as investment in AI continues to gather pace.

5. Instagram wrongly accuses some users of breaching child sex abuse rules

   It was "horrible", "stressful" and "isolating" those affected tell BBC News.