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I stared at the two boys in the photograph because I have two boys. But it was the little girls who commanded attention. They were tiny and big eyed, like fawns. Their red veils were trimmed with gold. Each seemed to be holding a flower.

My colleague, Muktita Suhartono, and I had come to Surabaya, an Indonesian city with alleyways of terra cotta roofed homes, largely on the basis of a single photo. It was a normal family portrait of a father, mother, two sons and two daughters.

On May 13, the entire family of six blew themselves up in coordinated suicide attacks on three Christian churches in Surabaya, killing a dozen bystanders and injuring at least 40 more. The boys were 15 and 17 when they died, the girls 8 and 12.