Pakistan ? The death toll from an overnight suicide attack on a Shiite Muslim procession in Pakistan’s biggest city rose today to 33, in violence blamed on extremists trying to hamper the fight against militants by sparking a sectarian war.

Angered over Monday’s attack, Shiites set fire to buildings and dozens of vehicles in Karachi, a sign of frustration by the minority sect, which has suffered frequent attacks by Sunni extremist groups who regard them as heretical.

TV footage showed firefighters struggling to extinguish blazes today. Sagheer Ahmed, the provincial health minister, said the death toll from the attack had risen to 33. Pakistani television stations said that three people who were hospitalized died overnight of their injuries.