Karachi blast kills 40

CNN reports.

(CNN) -- An explosion at a celebration of Prophet Mohammed's birthday has killed at least 40 people and sparked a confrontation between Muslims and Karachi police, according to Pakistan's interior minister and local media reports.

No claims of responsibility were made after Tuesday's blast, but sectarian violence between Sunni and minority Shiite Muslims has killed hundreds in Pakistan, and Karachi in particular, over the past two decades.

But I thought Islam was the religion of peace?

Since the Sunni and Shiite Muslims are killing each other, how come MSM aren't calling this a civil war?
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