An Afghan policeman stands guard in central Kabul, Saturday, April 6, 2013. NATO says a blast in Afghanistan has killed four coalition service members and two civilians working with the alliance. The blast from a roadside bomb occurred Saturday in southern Afghanistan.(AP Photo/Jawad Jalali)

Associated Press
An Afghan policeman stands guard in central Kabul, Saturday, April 6, 2013. NATO says a blast in Afghanistan has killed four coalition service members and two civilians working with the alliance. The blast from a roadside bomb occurred Saturday in southern Afghanistan.(AP Photo/Jawad Jalali)
An Afghan policeman stands guard in central Kabul, Saturday, April 6, 2013. NATO says a blast in Afghanistan has killed four coalition service members and two civilians working with the alliance. The blast from a roadside bomb occurred Saturday in southern Afghanistan.(AP Photo/Jawad Jalali)
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