The bodies of Afghan civilians allegedly shot by a rogue US soldier are pictured in the back of a van in Alkozai village of Panjwayi district, Kandahar province on March 11, 2012. An AFP reporter counted 16 bodies -- including women and children -- in three Afghan houses after a rogue US soldier walked out of his base and began shooting civilians early Sunday. NATO's International Security Assistance Force said it had arrested a soldier "in connection to an incident that resulted in Afghan casualties in Kandahar province", without giving a figure for the dead or wounded. AFP PHOTO/ MAMOON DURRANI

The bodies of an elderly Afghan man and a child are pictured in Alkozai village of Panjwayi district, Kandahar province on March 11, 2012. An AFP reporter counted 16 bodies -- including women and children -- in three Afghan houses after a rogue US soldier walked out of his base and began shooting civilians early Sunday. NATO's International Security Assistance Force said it had arrested a soldier "in connection to an incident that resulted in Afghan casualties in Kandahar province", without giving a figure for the dead or wounded. AFP PHOTO/ MAMOON DURRANI

The body of an Afghan child, allegedly shot by a rogue US soldier, are seen with other bodies in the back of a truck in Alkozai village of Panjwayi district, Kandahar province on March 11, 2012. An AFP reporter counted 16 bodies -- including women and children -- in three Afghan houses after a rogue US soldier walked out of his base and began shooting civilians early Sunday. NATO's International Security Assistance Force said it had arrested a soldier "in connection to an incident that resulted in Afghan casualties in Kandahar province", without giving a figure for the dead or wounded. AFP PHOTO/ JANGIR

A mourner cries over the bodies of Afghan civilians, allegedly shot by a rogue US soldier, seen loaded into the back of a truck in Alkozai village of Panjwayi district, Kandahar province on March 11, 2012. An AFP reporter counted 16 bodies -- including women and children -- in three Afghan houses after a rogue US soldier walked out of his base and began shooting civilians early Sunday. NATO's International Security Assistance Force said it had arrested a soldier "in connection to an incident that resulted in Afghan casualties in Kandahar province", without giving a figure for the dead or wounded. AFP PHOTO/ JANGIR

A man sits in the back of a truck with the bodies of several men and a child allegedly killed by a U.S. service member in Panjwai, Kandahar province south of Kabul, Afghanistan, Sunday, March 11, 2012. A U.S. service member walked out of a base in southern Afghanistan before dawn Sunday and started shooting Afghan civilians, according to villagers and Afghan and NATO officials. Villagers showed an Associated Press photographer 15 bodies, including women and children, and alleged they were killed by the American. (AP Photo/Allauddin Khan)

An Afghan woman, right, is interviewed as she sits next to the body of a child allegedly killed by a U.S. service member in Panjwai, Kandahar province south of Kabul, Afghanistan, Sunday, March 11, 2012. A U.S. service member walked out of a base in southern Afghanistan before dawn Sunday and started shooting Afghan civilians, according to villagers and Afghan and NATO officials. Villagers showed an Associated Press photographer 15 bodies, including women and children, and alleged they were killed by the American. (AP Photo/Allauddin Khan)

An Afghan youth mourns for relatives, who were allegedly killed by a U.S. service member in Panjwai, Kandahar province south of Kabul, Afghanistan, Sunday, March. 11, 2012. A U.S. service member walked out of a base in southern Afghanistan before dawn Sunday and started shooting Afghan civilians, according to villagers and Afghan and NATO officials. Villagers showed an Associated Press photographer 15 bodies, including women and children, and alleged they were killed by the American. (AP Photo/Allauddin Khan)

A villager points to a spot where a family was allegedly shot in their residence by a rogue US soldier in Alkozai village of Panjwayi district, Kandahar province on March 11, 2012. An AFP reporter counted 16 bodies -- including women and children -- in three Afghan houses after a rogue US soldier walked out of his base and began shooting civilians early Sunday. NATO's International Security Assistance Force said it had arrested a soldier "in connection to an incident that resulted in Afghan casualties in Kandahar province", without giving a figure for the dead or wounded. AFP PHOTO/ MAMOON DURRANI

Afghan men investigate at the site of an shooting incident in Kandahar province, March 11, 2012. Afghanistan's defence ministry said coalition forces killed 15 civilians in a shooting spree in Kandahar province on Sunday, an incident likely to deepen a crisis in relations between Washington and Kabul. REUTERS/Ahmad Nadeem