The Obama administration has developed a plan to begin transferring security duties in select areas of Afghanistan to that country's forces over the next 18 to 24 months, with an eye toward ending the American combat mission there by 2014, officials said Sunday.

The phased four-year plan to wind down American and allied fighting in Afghanistan will be presented at a NATO summit meeting in Lisbon later this week, the officials said. It will reflect the most concrete vision for transition in Afghanistan assembled by civilian and military officials since President Obama took office last year.

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