A 29-year-old man has been arrested on suspicion of murder, after a woman's body was found in a suitcase in north-west London.
The woman has not yet been formally identified.
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More than a tenth of the Piccadilly Line train fleet is out of action because of emergency repairs to damaged wheels.
Rows of students stood and turned their backs before filing out of the lecture theatre.
Effie the endangered Western lowland gorilla has given birth to a healthy baby boy at London Zoo.