WARSAW, Poland — NATO is seeking an additional 2,000 troops to bolster its force in Afghanistan amid increasing insurgent violence, a spokesman said Friday in Warsaw, where the alliance's defence chiefs were meeting.

NATO's top military commander, U.S. Gen. James Jones, on Thursday called on the 26 member countries to provide more troops for Afghanistan where the Taliban has been putting up surprisingly fierce resistance in recent months.

NATO spokesman Col. Brett Boudreau told The Associated Press call was for "2,000-plus" troops.

In a telephone interview ahead of the opening of the two-day conference, Boudreau said the defence chiefs were well aware of the demand for extra troops as the NATO forces engage in increasingly intense ground combat with the Taliban.

"This is not news to anybody," Boudreau said.

However, he said it was not sure the Warsaw meeting would produce a definite decision on reinforcements, because the generals may have to report back to political authorities in their homeland before authorizing additional deployments.

Defence Minister Gordon O'Connor has said that Canada, - with about 2,200 soldiers in Afghanistan - is doing more than its share and doesn't expect to be asked to increase its commitment.

On Friday, Turkey's top military commander said his country would not be contributing any combat troops. Turkey currently has 900 military personnel in Afghanistan helping with reconstruction.

Some 20,000 NATO soldiers and a similar number of U.S. forces are in Afghanistan trying to crush the emboldened Taliban insurgency. The heaviest fighting takes place across vast desert plains in southern Helmand and Kandahar provinces, where Canadian troops are currently leading an offensive against dug-in Taliban rebels in the Panjawii area.

The two provinces are also the centre of the country's massive opium trade.

The NATO meeting is held three times a year and is in Warsaw for the first time. Poland joined the alliance in 1999.