"This is the first time we have seen a sustained decline in civilian casualties which actually reverses a sustained five year trend of increasing of civilian casualties," UN human rights official James Rodehaver told AFP.
The United Nations said 1,145 Afghan non-combatants lost their lives, mostly in Taliban and other insurgent attacks, between January 1 and June 30 compared to 1,510 for the same period in 2011. Another 1,954 civilians were wounded, it added.
The UN mission in Afghanistan said that marked a 15 per cent decline on the 3,654 casualties documented during the first six months of 2011.
Last year as a whole, a record 3,021 civilians died as part of the decade-long war between Taliban insurgents and the NATO-backed Kabul government, the United Nations has said.
The findings come as 130,000 US-led NATO troops prepare to withdraw the bulk of their combat troops from Afghanistan in the next 18 months.
The apparent decline in civilian casualties contrasts to an 11 per cent increase in insurgent attacks reported by NATO in the last three months.
And as the Taliban increasingly target homegrown forces, Afghan troops have died at five times the rate of NATO soldiers, according to the independent website icasualties.org.
The United Nations said insurgents were responsible for 80 per cent of the civilian casualties in 2012, while pro-government forces, which include NATO, were blamed for 10 per cent. The remaining 10 per cent was attributed to unknown groups.
It said there had been a 53 per cent increase in targeted killings of civilians, picked out by insurgents because they work for the Afghan authorities or the military.
In the past, NATO air strikes have sparked huge controversy with President Hamid Karzai's government, but the UN report said civilian casualties from air strikes were down 23 per cent compared to the same period in 2011.
Women and children accounted for about 30 per cent of this year's casualties -- up one percent from the same period in 2011 -- killed or wounded mostly in Taliban roadside bombings with IEDs, the insurgents' weapon of choice.
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