Pope Benedict XVI appealed for peace Friday at a time of deep turmoil in the Middle East, calling the flow of weapons into Syria a ‘‘grave sin’’ as the country endures a bloody civil war.

The pope arrived in Lebanon for a three-day visit despite the recent unrest in region — including the war in neighboring Syria, a mob attack that killed several Americans in Libya, including the U.S. ambassador, and a string of violent protests across the region stemming from an anti-Islam film.

‘‘I have come to Lebanon as a pilgrim of peace,’’ the pope said upon his arrival in Beirut. ‘‘As a friend of God and as a friend of men.’’

But just hours after his arrival, violence erupted in northern Lebanon over the anti-Islam film produced in the United States called ‘‘Innocence of Muslims.’’ The movie ridicules the Prophet Muhammad, portraying him as a fraud, a womanizer and a child molester.

Continue Reading on www.boston.com