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Posted: 5/30/2013 1:59:35 PM EST
Iran's Minister of Petroleum Rostam Ghasemi, right, and Iran's Ambassador to the International Atomic Energy Agency, IAEA, Ali Asghar Soltanieh talk to journalists as they arrive at a hotel for the Organization of the Petroleum Exporting Countries, OPEC, conference in Vienna, Austria, Thursday, May 30, 2012. Once the symbol of oil dominance, OPEC faces new challenges as its members gather for a ministerial meeting on how much crude to pump. For the 12 oil ministers from countries ranging from Venezuela to Nigeria and Iran, the formal focus of Friday's get-together is to determine production levels. (AP Photo/Hans Punz)
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Posted: 5/30/2013 1:59:35 PM EST
Iran's Minister of Petroleum Rostam Ghasemi, right, and Iran's Ambassador to the International Atomic Energy Agency, IAEA, Ali Asghar Soltanieh talk to journalists as they arrive at a hotel for the Organization of the Petroleum Exporting Countries, OPEC, conference in Vienna, Austria, Thursday, May 30, 2012. Once the symbol of oil dominance, OPEC faces new challenges as its members gather for a ministerial meeting on how much crude to pump. For the 12 oil ministers from countries ranging from Venezuela to Nigeria and Iran, the formal focus of Friday's get-together is to determine production levels. (AP Photo/Hans Punz)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Vince Gill during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Vince Gill during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Reba McEntire during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Reba McEntire during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Miranda Lambert, right, during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Miranda Lambert, right, during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton, right, and Usher during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton, right, and Usher during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton, left is shown on stage with Alyson Costilla, second left, 18, and her family during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. Costilla lost her mother Terri Long in the storm. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton, left is shown on stage with Alyson Costilla, second left, 18, and her family during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. Costilla lost her mother Terri Long in the storm. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Darius Rucker during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Darius Rucker during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Brett Deering)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Trae Patton)
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Posted: 5/30/2013 1:39:22 AM EST
This image released by NBC Universal shows country singer Blake Shelton during the Healing in the Heartland: Relief Benefit Concert at the Chesapeake Energy Arena in Oklahoma City, Okla., Wednesday, May 29,2013. Funds raised by the benefit will go to the United Way of Central Oklahoma, for recovery efforts for those affected by the May 20 tornado. (AP Photo/NBC, Trae Patton)
