"The Americans are concerned about the core strategy being approved by everyone involved, " said the Nato official.
While the United States stands firm on limiting this round of expansion to Hungary, Poland and the Czech Republic, the NATO official said a final decision will be made only after debate among the leaders of the NATO countries that could be preceded by a meeting of NATO foreign ministers Tuesday morning.
According to the NATO military official who spoke with CNN, there were 39 such "green-on-green" incidents last year and already 31 this year.
CNN: Shootings by Afghan forces take growing toll on NATO troops
Without the assistance of any U.S. or NATO troops, the official said, the nationals tried to get a friend out of a Kandahar jail.
CNN: Karzai demands U.S. forces turn over Afghan killing suspects
Mr Rasmussen is in Tripoli to mark the official end of Nato's Libya mission.
"That is his own interpretation and we do not share it, " a French official told reporters at the NATO summit in Prague.
CENTERFORSECURITYPOLICY: Bigger NATO waters down statement on Iraq
Earlier Tony Blair's official spokesman acknowledged the disagreements within NATO were serious but stressed only three of the 19 allies had a different view.
The official spoke on condition of anonymity because the NATO investigation was not complete.
NATO's official goal of repatriation is the best long-term option both for refugees and for other countries, but it is also the most costly and difficult choice for western governments.
"The essential thing is for the U.S. to go first, " says a NATO official.
And then a senior administration official said last night that NATO had in fact agreed to the entire operation.
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