An Afghan demonstrator holds a copy of a half-burnt Koran, allegedly set on fire by US soldiers, at the gate of Bagram airbase during a protest against Koran desecration at Bagram, about 60 kilometres (40 miles) north of Kabul, on February 21, 2012. The copies of the burnt Korans and Islamic religious texts were obtained by Afghan workers contracted to work inside Bagram air base, and presented to demonstrators gathered outside the military installation. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO / Massoud HOSSAINI

Afghan demonstrators shout anti-US slogans at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

A wounded Afghan boy stands at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

People gather near a fire at Bagram airbase during a protest on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/Shah MARAI

Afghan youth throw stones toward US soldiers standing at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

Afghan youth throw stones toward US soldiers at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

An Afghan man aims a sling shot toward US soldiers at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

Afghan youth throw stones toward US soldiers at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

A US soldier wields his assault rifle (L) as another soldier handles a shotgun while standing at the gate of Bagram airbase during a protest against Koran desecration at Bagram, about 60 kilometres (40 miles) north of Kabul, on February 21, 2012. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO / Massoud HOSSAINI

Afghan youth take cover from the rubbers bullets shot by US soldiers at the gates of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

Assorted spent ordnance is strewn on the ground at a protest in front of Bagram airbase on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/Shah MARAI

Afghan youth throw stones toward US soldiers at the gate of Bagram airbase during a protest against Koran desecration on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai

Afghan demonstrators show copies of Koran books allegedly set alight by US soldiers, during a protest against Koran desecration at the gate of Bagram airbase on February 21, 2012 at Bagram about 60 kilometres (40 miles) north of Kabul. Afghan protestors firing slingshots and petrol bombs besieged one of the largest US-run military bases in Afghanistan, furious over reports that NATO had set fire to copies of the Koran. Guards at Bagram airbase responded by firing rubber bullets from a watchtower, an AFP photographer said as the crowd shouted "Allahu akbar, Allahu akbar" (God is greater). AFP PHOTO/SHAH Marai