Muslims around the world are observing the month of Ramadan. Those who practice the faith will fast from sun up until sun down for the next 30 days. During fasting hours, Muslims must abstain from food, sex, alcohol and smoking.
At sunset, they usually break fast with a meal known as Iftar. Muslims are also expected to give charity and study during the Holy month.
President Obama, Lupe Fiasco and others react on Twitter to Ramadan.
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