US vows full probe into Pakistan border incident

The Obama administration is pledging to conduct a full investigation into a NATO attack that allegedly killed 24 Pakistani troops.

Secretary of State Hillary Rodham Clinton and Defense Secretary Leon Panetta in a joint statement on Saturday said they had each spoken to their Pakistani counterparts to express their condolences for the loss of life.

The incident was a major blow to American efforts to rebuild an already tattered alliance vital to winding down the 10-year-old Afghan war. Islamabad called the bloodshed in one of its tribal areas a "grave infringement" of the country's sovereignty.

A Nato spokesman said it was likely that coalition airstrikes caused Pakistani casualties, but an investigation was being conducted to determine the details.

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