Reporting from Washington —
The new troop commitment, announced at a meeting of foreign ministers in Brussels, includes about 2,500 soldiers who are already in the Central Asian nation, many of whom were sent for the recent elections and will stay on.
Anders Fogh Rasmussen, the North Atlantic Treaty Organization's secretary-general, told reporters at the alliance's headquarters that at least 25 nations would provide the additional troops next year, "with more to come."
Friday's pledge was 2,000 troops higher than the number he had forecast this week.
Britain, which has 9,000 troops in Afghanistan, previously announced that it would be contributing an additional 500 troops.
Italy, Slovakia and Poland are also known to have agreed to increase their forces.
Two other major players, France and Germany, have also been asked to provide thousands of additional troops, but their response is not likely to be known for weeks. French President Nicolas Sarkozy has said that with the country's military overstretched, he would be unable to provide more.