The latest attacks took place on Ashura , the most important holy day on the Shiite calendar . At least four blasts have targeted Shiite mosques in Iran over the past three years . ( CNN ) -- Hundreds have been injured in those explosions .
The latest attacks took place on Ashura , the most important holy day on the Shiite calendar . At least four blasts have targeted Shiite mosques in Iran over the past three years . Hundreds have been injured in those explosions .