Honduras, Guatemala, and El Salvador have some of the highest murder rates in the world.
CENTERFORSECURITYPOLICY: Gangs and violence in Central America
They fear that easing access to handguns will lead to a rise in murder rates.
Murder rates are down to around five a day from more than a dozen before the pact.
Murder rates among Americans older than 25 had already been declining since 1980.
Just a few years after the stock market crashed in 1987, murder rates hit historic highs in cities across the country.
In recent years, Guatemala has had one of the highest per capita murder rates in the world, according to the United Nations.
Venezuela still has one of the highest murder rates in the hemisphere.
South Africa has some of the world's highest murder rates, with nearly 50 people killed each day in the nation of 50 million.
But Central American leaders, whose countries suffer some of the highest murder rates in the world, say they plan to debate the issue further.
They claimed that higher levels of inequality were associated with higher murder rates, lower life expectancy, more obesity and all manner of other ills.
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It cites what is said was a "lukewarm" public reaction to new data showing that their country now has murder rates below Japan and Switzerland.
The nation, mired in political crisis since President Manuel Zelaya was ousted in June, also has one of the highest murder rates in the region.
As Mr Livingstone likes to observe, a city that once exemplified lawlessness has cut robbery and murder rates by almost three-quarters since the early 1990s.
Yet South Africa still has one of the world's highest murder rates, at 37 per 100, 000 inhabitants: six times America's rate and nearly 20 times Britain's.
More than 500 people have been stabbed to death in Scotland over the last 10 years, giving the country one of the highest murder rates in Europe.
Mental health treatment has not made a dent in suicide statistics, but reducing access to the most lethal methods can drastically lower overall suicide and murder rates.
In recent years, Guatemala has had one of the highest per capita murder rates in the world, according to the United Nations: 40 homicides per 100, 000 inhabitants in 2010.
The funny thing is that, even though Baltimore had one of the top murder rates in the country in those days, I grew up hearing about how dangerous New York was.
President Enrique Pena Nieto has made the fight against organised crime one of his main priorities and has announced the creation of a new federal police force to help drive down murder rates.
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Leaders like Chicago Police Commissioner Garry McCarthy and Chicago Mayor Rahm Emanuel need to figure out why murder rates in cities like New York and Los Angeles are plummeting while Chicago's continues to soar.
Though murder rates continue to slide, only 20% of those asked in a poll in September said they felt safe in their city and 27% said they had been victims of crime in the previous year.
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After coming into power in December 2012, President Enrique Pena Nieto has made the fight against organised crime one of his main priorities and has announced the creation of a new federal police force to help drive down murder rates.
The old New Orleans had some of the highest poverty and murder rates in the country, and so well before Hurricane Katrina was ever a blip on the radar screen, Pres Kabakoff was wrestling with how to make his hometown more liveable and attractive.
The report also says rates of murder and violent crime have fallen more rapidly in the UK in the past decade than many other countries in western Europe.
BBC: UK Peace Index says South Wales is most peaceful urban area
Despite the fact that many other countries have similar requirements (and yes, much lower rates of murder and mayhem), gun groups in our country have raised alarmist concerns about the "logistical nightmare" of background checks for private sales.
The anti-social behaviour figures follow the release of the UK Peace Index, a report by the Institute for Economics and Peace, on Wednesday, which found rates of murder and violent crime have fallen more rapidly in the UK in the past decade.
Since the Federal Assault Weapons Ban expired in September 2004, murder and overall violent-crime rates have fallen.
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