Taliban's Killing of Top Negotiator a 'Clear Signal'...
Clip: 09/20/2011 | 5m 14s
Burhanuddin Rabbani, a former Afghan president in charge of negotiating with the Taliban, was killed Tuesday by a suicide bomber posing as a peace envoy. Margaret Warner gets the latest details, reactions and information on the suspected perpetrators from Patrick Quinn of The Associated Press, speaking from Kabul.
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