An Afghan boy sells balloons during a gathering to celebrate the Afghan New Year (Nawroz) in Kabul March 21, 2013. Nawroz, also known as Persian New Year, is observed during the March equinox, marking the first day of spring. REUTERS/Mohammad Ismail (AFGHANISTAN - Tags: SOCIETY RELIGION) 

Afghans gather to celebrate Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY TPX IMAGES OF THE DAY) 

Afghans gather to watch men erect a pole during a celebration for Afghan New Year (Nawroz) in Kabul March 21, 2013. The pole-erecting ceremony, where men erect a flag pole with a bouquet of plastic flowers, is held as part of Nawroz celebrations to symbolize good fortune in the new year. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY RELIGION) 

An Afghan man tries to kiss a religious pole at a gathering to celebrate the Afghan New Year (Nawroz) in Kabul March 21, 2013. A pole-erecting ceremony, where men erect a flag pole with a bouquet of plastic flowers, is held as part of Nawroz celebrations to symbolize good fortune in the new year. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY RELIGION SOCIETY) 

Afghans gather to celebrate Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY) 

Afghans gather to celebrate Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY) 

Afghans gather to celebrate Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY) 

Afghan policemen keep watch during celebrations for Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY) 

An Afghan boy plays with toy guns during a gathering to celebrate the Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY) 

Afghan children play on a manually operated ferris wheel during a celebration for Afghan New Year (Nawroz) in Kabul March 21, 2013. Afghanistan uses the Persian calendar which runs from the vernal equinox. The calendar takes as its start date the time when the Prophet Mohammad moved from Mecca to Medina in 621 AD. The current Persian year is 1392. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: ANNIVERSARY SOCIETY) 

Children play on a ferris wheel during a gathering to celebrate the Afghan New Year (Nawroz) in Kabul March 21, 2013. Nawroz, also known as Persian New Year, is observed during the March equinox, marking the first day of spring. REUTERS/Mohammad Ismail (AFGHANISTAN - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY) 

Afghan soldiers sit during a gathering to celebrate Afghan New Year (Nawroz) in Kabul March 21, 2013. Nawroz, also known as Persian New Year, is observed during the March equinox, marking the first day of spring. REUTERS/Mohammad Ismail (AFGHANISTAN - Tags: RELIGION SOCIETY) 

Afghans travel in a horse cart during a gathering to celebrate the Afghan New Year (Nawroz) in Kabul March 21, 2013. Nawroz, also known as Persian New Year, is observed during the March equinox, marking the first day of spring. REUTERS/Mohammad Ismail (AFGHANISTAN - Tags: SOCIETY RELIGION)