Growing inequality in US cities could lead to widespread social unrest and increased mortality, says a new United Nations report on the urban environment.

In a survey of 120 major cities, New York was found to be the ninth most unequal in the world and Atlanta, New Orleans, Washington, and Miami had similar inequality levels to those of Nairobi, Kenya Abidjan and Ivory Coast. Many were above an internationally recognised acceptable "alert" line used to warn governments.

"High levels of inequality can lead to negative social, economic and political consequences that have a destabilising effect on societies," said the report. "[They] create social and political fractures that can develop into social unrest and insecurity."

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