Police guard the house of 72-year-old Rosemary Shearman, who was killed in a random attack by a stranger.
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A report by a London university has found that chief police officers use "predatory" behaviour towards junior staff.
A man from north London has been jailed for 27 years for owning guns and conspiring to supply drugs. Two others were also jailed.
One of the country's most extravagant private homes has been snapped up for just a quarter of the original £100 million asking price