Flowers and ribbons adorn a tree outside the Weinstein familyhouse in Rockville, Md., Thursday, April 23, 2015. Earlier, President Barack Obama took full responsibility for the counterterror missions and offered his "grief and condolences" to the families of the hostages, Warren Weinstein of Rockville, Maryland, and Giovanni Lo Porto who were inadvertently killed by CIA drone strikes early this year. (AP Photo/Jose Luis Magana)
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