The city of Jos sits on an invisible fault line between Nigeria's mostly Christian south and its largely Muslim north. Its population is almost 50-50 Muslim-Christian.
So it's not surprising that twin car bombs in a crowded downtown vegetable market on May 20 killed both Christians and Muslims. Most of the 133 victims were women, and 25 were children.
But that could have been only the beginning of the killing, as was the case in the past.
"The choice of Jos, to make this very huge bomb, was deliberate," says Ezekiel Gomos, head of the Jos Business School.