Afghan police control the crowd during the celebration of the Afghan New Year (Nawruz) in Kabul March 21, 2010. 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 1389. REUTERS/Ahmad Masood (AFGHANISTAN - Tags: SOCIETY)