Muslims celebrate Ramadan

Workers break fast at Riyadh's Imam Turki bin Abdullah Mosque, on the first day of the Muslim fasting month of Ramadan July 20, 2012. Muslims around the world abstain from eating, drinking and conducting sexual relations from sunrise to sunset during Ramadan, the holiest month in the Islamic calendar. [Photo/Agencies]

Muslims attend a mass prayer session "Tarawih" marking the beginning of the holy fasting month of Ramadan in a mosque in Makassar of Indonesia's South Sulawesi province July 20, 2012. The Indonesian government has set Ramadan to fall on July 21. [Photo/Agencies]