2,500 blasts strike a Sunni Muslim procession in 30-minute span . 7 people are wounded , with 218 in critical condition , officials say . 218 police officers were assigned to procession after attack warning .
Three blasts strike a Shiite procession in 30-minute span . 218 people are wounded , with 7 in critical condition , officials say . 2,500 police officers were assigned to procession after attack warning .