NATO’s top official has expressed deep concern to Afghan President Hamid Karzai over the surge of assaults by Afghan troops on their foreign allies.

Spokesperson Carmen Romero said Mr. Karzai had assured Secretary-General Anders Fogh Rasmussen in a phone conversation on Wednesday that he was doing all he could to stop the attacks.

The spike of insider attacks has sparked concerns that Afghan forces will not be capable of taking over security by 2014 as planned.

U.S. Gen. John R. Allen, who commands NATO’s 129,000-strong force, briefed the alliance’s top decision-making body on Wednesday about the attacks.

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