Pulitzer prize-winning photographer Anja Niedringhaus was shot and killed by an Afghan police officer while she was traveling with a reporter in Afghanistan's Khost province in a convoy with election workers. Reporter Kathy Gannon, who was wounded in the attack, is reported to be in stable condition.

Niedringhaus, a photographer for the Associated Press, covered conflicts from Bosnia to Afghanistan for the last two decades, and in 2005, she was awarded the Pulitzer prize as part of a team of AP photographers covering the war in Iraq. She photographed the aftermath of the Sept. 11 attacks in New York City, and then headed to the coalition forces' battle with Taliban fighters in Afghanistan.

“Anja and Kathy together have spent years in Afghanistan covering the conflict and the people there. Anja was a vibrant, dynamic journalist well-loved for her insightful photographs, her warm heart and joy for life. We are heartbroken at her loss,” AP Executive Editor Kathleen Carroll said in a statement issued by the wire service.

Two years ago, in a reflection about her work for Neiman Reports, Niedringhaus said that covering conflict and war is the essence of journalism for her.

"My assignment, regardless of the era, is about people—civilians and soldiers," she wrote. "The legacy of any photographer is her or his ability to capture the moment, to record history. For me it is about showing the struggle and survival of the individual."

Here are some of the images captured by Anja Niedringhaus over the years.

See more images by Niedringhaus below.