NPR National Stories

A 25-year-old man has been charged with killing the author of American Sniper and another person at a Texas gun range.

Former Navy SEAL Chris Kyle wrote American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History, a best-seller that detailed his more than 150 kills of insurgents between 1999 and 2009. He also set up FITCO Cares, a nonprofit that helps soldiers deal with post-traumatic stress disorder.

Update at 1:32 p.m. ET. Toll Rises:

The death toll from the coordinated attacks in the oil-rich city of Kirkuk has risen: The BBC says at least 16 people are dead, while Al Jazeera puts the number at at least 30.

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Iran's foreign minister on Sunday welcomed Vice President Joe Biden's comments that the U.S. was willing to hold direct talks with the Islamic republic over its nuclear program.

"We have no red line for bilateral negotiations when it comes to negotiating over a particular subject," Ali Akbar Salehi said at a security conference in Munich, Germany. "If the subject is the nuclear file, yes, we are ready for negotiations but we have to make sure ... that the other side this time comes with authentic intention, with a fair and real intention to resolve the issue."

In response to the growing concern over China's air pollution, a theatrical Chinese entrepreneur is selling cans of fresh air.

Americans seeking stem cell replacement therapy hope the process can heal them of myriad diseases, and a 2011 report by the Baker Institute estimated the industry could bring in $16 billion in revenue by 2020.