Activists of Pakistan's Sunni Tehreek (ST) burn US flags during a protest rally to condemn US threats in Karachi on September 28, 2011. The United States stepped up pressure on the Pakistani government, saying it must clamp down on the Haqqani network blamed for the attack on the US embassy in Kabul. Last week, the outgoing top US military officer, Admiral Mike Mullen, bluntly accused Pakistan of "exporting" violent extremism to Afghanistan through proxies and warned of possible action to protect US troops. AFP PHOTO / ASIF HASSAN (Photo credit should read ASIF HASSAN/AFP/Getty Images)
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AFP ASIF HASSAN