A Palestinian sweet-maker prepares sweets consumed during Ramadan in the West Bank city of Nablus, on July 20, 2012. Muslims worldwide Friday started to observe Ramadan, the Islamic month of fasting. During Ramadan, Muslims refrain from food and drink from dawn to dust, which is a very important religious practice in Islam. (Xinhua/Ayman Nobani)

Muslims pray at the Dongguan Mosque in Xining, capital of northwest China's Qinghai Province, July 20, 2012, on the first day of the Muslim holy month of Ramadan. (Xinhua/Wu Gang)

Muslims pray at the Dongguan Mosque in Xining, capital of northwest China's Qinghai Province, July 20, 2012, on the first day of the Muslim holy month of Ramadan. (Xinhua/Wu Gang)

This photo provided by the Egyptian Presidency shows Egyptian president Mohamed Morsi (3rd, L) prays at a mosque in his hometown of Zagazig, Egypt, July 20, 2012. In Egypt, Ramadan began on Friday. "Ramadan is a month of fasting and worship... and it is also a month of work and production," Morsi said, repeatedly calling on Egyptians to "keep working." (Xinhua/Egyptian Presidency)

A Libyan man reads Koran in a mosque in the Libyan capital Tripoli on July 20, 2012, the first day of Ramadan (the Islamic month of fasting). (Xinhua/Hamza Turkia)

A man presents Turkey's traditional silver handicrafts in the Bazaar at the square near Blue mosque in Istanbul on July 20, 2012, the first day of Ramadan (the Islamic month of fasting). (Xinhua/Ma Yan)

Pakistani Muslims offer special evening prayer "Taraweeh" in southern Pakistani port city of Karachi on July 20, 2012. The Muslim fasting month of Ramadan will begin in Pakistan on Saturday, the official moon sighting committee comprising religious scholars announced. (Xinhua/Masroor)