Story highlights The U.S. promises a "transparent, timely and thorough" investigation of the incident

U.S. airstrike on an Afghan army outpost killed 8 and wounded 5, police say

Kabul, Afghanistan (CNN) A U.S. airstrike on an Afghan National Army outpost in eastern Logar province Monday killed eight soldiers and wounded five others, police said.

The airstrike took place around 7:30 a.m. local time, police Chief Mohammad Daud Ahmadi said.

U.S. Army Gen. John Campbell, commander of United States Forces-Afghanistan, issued a statement saying he regrets that lives were lost and sends his condolences to those affected by the tragedy. The statement referred to a lower death toll, seven, than that provided by Afghan police.

"We have initiated an investigation of this incident," said Brig. Gen. Wilson Shoffner, deputy chief of staff for communications. "Alongside our Afghan partners, we will complete a joint investigation in a transparent, timely and thorough manner and will release further details regarding this incident as they become available."

Another local official said two helicopters fired on the Afghan National Army outpost from two sides.

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