While violence in Iraq is down from its peak in 2006-2007, Al-Jazeera reports that attacks "fueled by sectarian and political unrest" occur on almost daily basis, including a string of bomb attacks across the country in recent months, according to the BBC.
And on Sunday, the BBC also reports that explosions in a Muslim Shiite neighborhood of Karachi, Pakistan, left dozens dead, increasing concerns for the safety of the country's minority Shiite Muslims who have recently faced other deadly attacks in the Sunni-Muslim-majority country.
A recent study by the Pew Research Center indicates that acts of sectarian violence such as these occurred in more than 1-in-8 countries worldwide in the year ending in mid-2010, the latest year for which data are available, up from fewer than 1-in-10 just several years earlier (see table below).
Sectarian violence occurs in countries as diverse as Myanmar, where a deadly exodus of Muslim Rohingyas fleeing attacks is underway, to Nigeria, where Reuters reports that clashes last week between Christian and Muslim youths in the country's eastern Taraba state killed more than 15 people.
For more information on the rising tide of social hostilities involving religion and government restrictions on religion around the world, see the 2012 report by the Pew Research Center's Forum on Religion & Public Life.