Assistant Commissioner Mark Rowley from the Met said: "We've taken a fresh look at policing London and London's obviously a world city.
"The recent census has shown what a big proportion of people in London come from far-flung places...It's important to us to be able to deal equally well with them as local offenders."
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The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants
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John Tomlin is convicted of two counts of inflicting grievous bodily harm with intent for throwing acid on Resham Khan and Jameel Muhktar.