London's police chief says there is a growing chance of a 'lone wolf' terror attack in Britain.
Metropolitan Police Commissioner, Sir Bernard Hogan-Howe says police have foiled one such plot a year on average, in recent years.
But he warns officers have foiled four or five in 2014.
As UK correspondent Olly Barratt reports, he's used a TV interview to call for public support in foiling more.
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