 A U.S. soldier stands guard near residents during a patrol in central Baghdad's Fadhil neighbourhood, April 16, 2008. Al Qaeda has been pushed out of the area, but residents still lack essential services, residents said. Picture taken April 16, 2008. REUTERS/Erik de Castro (IRAQ)
 U.S. soldiers stand guard outside a shop in central Baghdad's Shorja market, April 16, 2008. Al Qaeda has been pushed out of the area, but residents still lack essential services, residents said. Picture taken April 16, 2008. REUTERS/Erik de Castro (IRAQ)
 Bus passengers look at a U.S. soldier from the Alpha Troop, 3-89 CAV during a patrol in Baghdad's Fadhil district April 16, 2008. (Erik de Castro/Reuters)
 U.S. Army soldiers from B Company, 1st Squadron, 2nd Stryker Cavalry Regiment search a school during their patrol in the Shiite stronghold of Sadr City in Baghdad, Iraq, Thursday, April 17, 2008. (AP Photo/Maya Alleruzzo)
 A U.S. Army soldier from B Company, 1st Squadron, 2nd Stryker Cavalry Regiment peers around a corner after hearing shots fired during their patrol in the Shiite stronghold of Sadr City in Baghdad, Iraq on Thursday, April 17, 2008. (AP Photo/Maya Alleruzzo)

 An Iraqi soldier searches a car at a checkpoint in Baghdad on April 17. A suicide bomber blew himself up in a crowd of mourners north of Baghdad, killing at least 51 people in one of the biggest insurgent attacks in violence-wracked Iraq this year. (AFP/Sabah Arar)
 A policeman wears a mask as he directs traffic on a dusty day in Baghdad April 17, 2008. A dust storm stopped flights and clouded visibility in the Iraqi capital on Thursday. REUTERS/Ceerwan Aziz (IRAQ)
 Iraqi police patrol the southern city of Basra. Iraqi troops were in a tense standoff with radical Shiite cleric Moqtada al-Sadr's supporters on Friday after they surrounded an office block occupied by the group in the southern city of Basra. (AFP/Essam al-Sudani)
 An Afghan policeman runs for cover as members of the Taliban open fire on coalition forces near Masum Ghar military base in Zhari district, some 40 km (25 miles) west of Kandahar, April 18, 2008. REUTERS/Goran Tomasevic (AFGHANISTAN)
 An Afghan policeman is seen in position as members of the Taliban open fire on coalition forces near the Masum Ghar military base in Zhari district, some 40 km (25 miles) west of Kandahar, April 18, 2008. REUTERS/Goran Tomasevic (AFGHANISTAN)
 U.S Army Captain Greg Lockhart checks a road for bombs near Masum Ghar military base in Zhari district, some 40 km (25 miles) west of Kandahar, April 18, 2008. REUTERS/Goran Tomasevic (AFGHANISTAN)
 A U.S. soldier of 101st Airborne Division stands guard as an Afghan police officer enters a house for search in Mandozai, in Khost province, Afghanistan, Friday, April 18, 2008. U.S. troop levels in Afghanistan now top 32,000, the highest number of American forces in the country since the 2001 U.S.-led invasion that toppled the Taliban. (AP Photo/Rafiq Maqbool)
 A U.S. soldier of 101st Airborne Division stand guard as Afghan police search the house in Mandozai, in Khost province, Afghanistan, Friday, April 18, 2008. U.S. troop levels in Afghanistan now top 32,000, the highest number of American forces in the country since the 2001 U.S.-led invasion that toppled the Taliban. (AP Photo/Rafiq Maqbool)
 US soldiers of the 101st Airborne Division guards during a night patrol in Khost province, Afghanistan, Thursday, April 17, 2008, in this image taken through night vision equipment. U.S. troop levels in Afghanistan now top 32,000, the highest number of American forces in the country since the 2001 U.S.-led invasion that toppled the Taliban. (AP Photo/Rafiq Maqbool
 U.S. Sgt Anthony Luke of the 101st Airborne Division patrols as Afghan boys look on in Khost province, Afghanistan, Thursday, April 17, 2008. U.S. troop levels in Afghanistan now top 32,000, the highest number of American forces in the country since the 2001 U.S.-led invasion that toppled the Taliban. (AP Photo/Rafiq Maqbool)
 U.S. Sgt Robert Kidwell, of of the 101st Airborne Division, examines an Afghan boy during a patrol in Khost province, Afghanistan, Thursday, April 17, 2008. U.S. troop levels in Afghanistan now top 32,000, the highest number of American forces in the country since the 2001 U.S.-led invasion that toppled the Taliban. (AP Photo/Rafiq Maqbool)
 U.S. Staff Sgt. Mac Blocker of the 101st Airborne Division stands guard as Afghan boys look on during a search to their house in Mandozai, in Khost province, Afghanistan, Friday, April 18, 2008. U.S. troop levels in Afghanistan now top 32,000, the highest number of American forces in the country since the 2001 U.S.-led invasion that toppled the Taliban. (AP Photo/Rafiq Maqbool)
 Iranian army soldiers march during the Army Day military parade in Tehran April 17, 2008. Iranian President Mahmoud Ahmadinejad said on Thursday "satanic" foreign forces had failed in their bid to dominate the Middle East's energy resources and did not dare threaten Iran. REUTERS/Morteza Nikoubazl (IRAN)
 A paramilitary soldier watches residents leave an area affected by clashes between two rival factions in the Khyber tribal agency near Peshawar April 17, 2008. At least 20 people were killed and dozens others injured in the clashes between the two factions in Khyber Agency area of Jamrud, local media reported. REUTERS/Stringer (PAKISTAN)
 Paramilitary soldiers man a makeshift bunker in Khyber tribal agency following clashes between two rival factions near Peshawar April 17, 2008. At least 20 people were killed and dozens others injured in the clashes between the two factions in Khyber Agency area of Jamrud, local media reported. REUTERS/Stringer (PAKISTAN)
 Israeli soldiers return to Israel from an operation inside the Gaza Strip near the refugee camp of al-Bureij. Israel and the Islamist Hamas movement traded threats, a day after a fierce incursion into the Gaza Strip killed 18 Palestinians, including a cameraman for an international news agency. (AFP/David Buimovitch) Photo Tools
 Sri Lankan police commandos participate in a parade held to mark the 25th anniversary of the police commando unit in Colombo, Sri Lanka, Friday, April 18, 2008. (AP Photo/Eranga Jayawardena)
 An armed soldier watches crowds during independence celebrations in Harare, Friday, April 18, 2008. Mugabe's first major speech since last month's disputed elections was the main event of an Independence Day program that looked more like a rally for his party than a national celebration. Many in the crowd of 30,000 listening to him at a Harare sports stadium waved the party's flag and wore T-shirts with its campaign slogan from the March 29 election: 'Vote for the fist.' (AP Photo)
 In this photograph made available by Albany Associates, children sit outside a meeting between United Nations and African Union Special Envoys for Darfur Jan Eliasson and Salim Ahmed Salim, and field commanders of the Sudan Liberation Army's Abdel-Wahed faction (SLA-AW) Thursday April 17, 2008 in the mountainous area of Nertiti, on the edge of Jebel Marra in central Darfur. (AP Photo/Albany Associates/Stuart Price, HO)
 Thai soldiers. Thailand has extended emergency rule in the Muslim-majority south, with the prime minister promising that the divisive law would not last forever (AFP/File/MADAREE TOHLALA) Photo Tools
 East Timor's President Jose Ramos-Horta visits the headquarters of the Portuguese Special Police for the United Nations in Dili April 18, 2008. REUTERS/Dadang Tri (EAST TIMOR)
 East Timorese President Jose Ramos-Horta arrives in Dili as UN peacekeeping soldiers secure the airport. Ramos-Horta returned home to be greeted by huge crowds and tight security two months after nearly being shot dead in a rebel attack. (AFP/Mario Jonny Dos Santos)
 Bulgarian army soldiers are seen during a send-off ceremony at the military base in the town of Karlovo, east of the Bulgarian capital Sofia Thursday, April 17, 2008. Bulgaria will send a combat unit of 200 on a guarding mission to Kandahar, Afghanistan. (AP Photo/Petar Petrov)

 Police officers escort alleged drug traffickers at a police station in Bogota, Thursday, April 17, 2008. Seven people were arrested for allegedly conspiring to smuggle cocaine in several anti-drug operations coordinated by Colombian police and U.S. Drug Enforcement Administration, DEA, a Colombian police report said. (AP Photo/Fernando Vergara)
 A soldier stands on guard outside an electoral center in Asuncion, Friday, April 18, 2008. Paraguay's government began the distribution of 'electoral kits' for Paraguay's presidential elections scheduled for April 20. (AP Photo/Jorge Saenz)
 A Paraguayan policeman stands next to the campaign headquarters of presidential candidate for the opposition Patriotic Alliance for Change Fernando Lugo in Asuncion, April 18, 2008. Voters will decide on Sunday whether or not to end the 61-year reign for the Colorado Party, the world's longest-ruling political party still in power. REUTERS/Enrique Marcarian (PARAGUAY)
 A soldier guards the beach area of the hotel where the World Economic Forum on Latin America is being held in the resort city of Cancun, Mexico, Wednesday, April 16, 2008. Strong economic growth is still possible throughout Latin America despite a sharp downturn in the U.S. economy, top business and government leaders said at the regional economic forum in Cancun. (AP Photo/Israel Leal)
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