In other news Monday, an Afghan policeman turned his gun on American troops, killing six of them during a NATO training exercise in eastern Afghanistan, before he was killed.

Margaret Warner talks to Ingrid Betancourt about her new memoir, "Even Silence Has an End," and her years as a hostage in the Colombian jungle.

In other news Monday, a car bomb went of in a market area and killed six children in Afghanistan. Also, the Netherlands became the first NATO country to pull troops out of the Afghan war.