Metropolitan Police Commissioner Sir Bernard Hogan-Howe said that he was "shocked" by allegations that undercover officers hunted for information to smear the family of murdered teenager Stephen Lawrence.
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Police are appealing for information about a man who racially abused a 23-year-old woman and then began "throwing punches in her direction".
The conmen, including a former X Factor contestant, were sentenced for the 'heartless' scam, which preyed on vulnerable people.
Police are appealing for information about two sisters aged 12 and five who went missing three days ago.