HARI SREENIVASAN:

President Obama announced today he will keep American troops in Afghanistan through the end of his presidency, extending America's longest war.

The policy reversal comes after weeks of worsening violence and significant gains by Taliban fighters. We will have more on the details of the decision right after the news summary.

Meanwhile, the Associated Press revealed new details today about the U.S. airstrike that killed 22 patients and staff at a Doctors Without Borders hospital in Afghanistan. It said U.S. special operations analysts knew the Kunduz clinic was a medical site, but believed it was being used by a Pakistani operative coordinating Taliban activity. Doctors Without Borders has disputed that claim.

At the White House, Press Secretary Josh Earnest said he wasn't aware of the AP's report, but pledged a complete investigation.