Downing Street has said David Cameron wishes Baroness Thatcher "a speedy recovery".
Former Prime Minister Margaret Thatcher is in hospital recovering from an operation to remove a bladder growth.
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A 35-year-old and a 27-year-old man, both from the Birmingham area, have been arrested and remain in police custody.
Molly Owens, was reported missing on Friday and is believed to be with her father, who is wanted after failing to appear in court.
Former Diversity dancer Robert Anker has died in a car crash in Canada.