Police Officers say they fear a repeat of last summer's riots, according to a new study.
The research, carried out by the London School of Economics and the Guardian, also suggests that police don't have the resources to cope with such disorder.
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A man said to be armed with dangerous articles remains inside an address in west London.
Police have begun a murder investigation following the stabbing of a 28-year-old in Shepherd's Bush,west London.
Armed police have been called to a property in Northolt following reports of a man with hazardous items inside.