Members of the Iraqi Special Operations Forces take part in an intensive security deployment in Baghdad
Members of the Iraqi Special Operations Forces take part in an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. The United States is contemplating talks with its arch-enemy Iran to support the Iraqi government in its battle with Sunni Islamist insurgents who routed Baghdad's army and seized the north of the country in the past week. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) MILITARY CONFLICT)
Members of the Iraqi Special Operations Forces take part in an intensive security deployment in Baghdad
Members of the Iraqi Special Operations Forces take part in an intensive security deployment in Baghdad's Amiriya district, June 18, 2014. The United States is contemplating talks with its arch-enemy Iran to support the Iraqi government in its battle with Sunni Islamist insurgents who routed Baghdad's army and seized the north of the country in the past week. REUTERS/Thaier Al-Sudani (IRAQ - Tags: CIVIL UNREST POLITICS) MILITARY CONFLICT)
File photo of Baiji oil refinery, north of Baghdad
A general view of Baiji oil refinery, north of Baghdad in this January 21, 2009 file photo. Sunni militants attacked Iraq's largest oil refinery, located in Baiji in northern Iraq, with machine-gun fire and mortars on June 18, 2014, Iraqi security sources and refinery employees said. The attack started at 4 am (0100 GMT) from outside two of the three main entrances to the sprawling facility, the sources said. REUTERS/Thaier al-Sudani/Files (IRAQ - Tags: CIVIL UNREST POLITICS ENERGY CONFLICT MILITARY)
A youth displaced by the fighting charges batteries with solar panels at a makeshift shop in a camp for IDPs at the UN base in Bentiu
A youth displaced by the fighting charges batteries with solar panels at a makeshift shop in a camp for internally displaced persons (IDPs) at the United Nations (UN) base in Bentiu, Unity State, June 17, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS SOCIETY)
Children displaced by the fighting bath in a pond, where people swim, bath and take washing and drinking water from, in a camp for IDPs at the UN base in Bentiu
Children displaced by the fighting bath in a pond, where people swim, bath and take washing and drinking water from, in a camp for internally displaced persons (IDPs) at the United Nations (UN) base in Bentiu, Unity State, June 17, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS SOCIETY)
People displaced by the fighting wait to get clean water at a water point in a camp for IDPs at the UN base in Bentiu
People displaced by the fighting wait to get clean water at a water point in a camp for internally displaced persons (IDPs) at the United Nations (UN) base in Bentiu, Unity State, June 17, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS SOCIETY)
Women displaced by the fighting wait to get clean water at a water point in a camp for IDPs at the United Nations (UN) base in Bentiu
Women displaced by the fighting wait to get clean water at a water point in a camp for internally displaced persons (IDPs) at the United Nations (UN) base in Bentiu, Unity State, June 17, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS SOCIETY)
Girls displaced by the fighting jump rope while women carry food in a camp for IDPs at the UN base in Bentiu
Girls displaced by the fighting jump rope while women carry food in a camp for internally displaced persons (IDPs) at the United Nations (UN) base in Bentiu, Unity State, June 17, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS SOCIETY)
Women displaced by the fighting wait to get clean water at a water point in a camp for IDPs at the UN base in Bentiu
Women displaced by the fighting wait to get clean water at a water point in a camp for internally displaced persons (IDPs) at the United Nations (UN) base in Bentiu, Unity State, June 17, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS SOCIETY)