Virgin Media customers said they are being spammed with "hundreds" of emails after they were able to "reply all" to a group message sent by the firm.
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Muhiddin Mire cut the throat of a stranger at an east London tube station "in revenge for the fight against IS", a court heard.
The significant development came after a forensic re-examination of a palm print left on a getaway vehicle.
Carla Lane was once one of the UK's highest paid screenwriters.