The story

A formal investigation into an attack on a U.S. Army unit by about 200 Taliban insurgents will examine whether the Army had intelligence about a possible assault and whether the troops had access to it.

The fact-finding mission was launched Thursday, several military officials said, after nine American soldiers were killed in Sunday's assault in Afghanistan.

When the attack occurred, the U.S. and Afghan soldiers were scouting for a location in the remote area to set up a coalition observation point. The Taliban never breached the main coalition base near the village of Wanat in Kunar province, which borders Pakistan. Read full article »

CNN's Barbara Starr and Jamie McIntyre contributed to this report.

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