IVAN WATSON, CNN SENIOR INTERNATIONAL CORRESPONDENT: At least killed and so many hundreds more maimed and wounded. That's not even counting the psychological trauma. I talked to an Australian Sri Lankan father, whose wife and 10-year- old daughter, they were both killed in the church that is in the darkness behind me on Easter Sunday. He said that it took him at least a half hour to find their bodies after the initial blast. And that his daughter was dead. And his wife was still trying to say something before she passed away in his arms. And in a moment, he's lost his entire family. I talked to the head mistress of a catholic school who said eight of her students had been killed in this blast. In this community, one household has lost seven people. These are just a fraction of the hundreds of people whose families have been irreparably changed by these moments of hatred. The catholic priests that I'm talking to are carefully repeating a message again and again to their congregations, to stay calm, not to engage in reprisals. And that's a real concern because Sri Lanka is a multi-ethnic, multi-sectarian country. There has been interreligious violence in the past in this country, as well as a civil war that went on for decades. So that message of peace very important at a time right now when people are so grief stricken and justifiably angry. Some of that anger directed at the government for failing to act on the intelligence warnings and for failing to protect churches that the Indian intelligence said were in the crosshairs of these Islamist extremists. A local home-grown group, but, of course, ISIS has also claimed responsibility for these acts of mass murder. Jim and Poppy.</s>JIM SCIUTTO, CNN ANCHOR: The scale twice as deadly as the Paris attacks.</s>POPPY HARLOW, CNN ANCHOR: Yes.</s>SCIUTTO: It's just horrendous. Ivan Watson on the ground, thanks very much. And we'll be right back.
Sri Lanka Warned Before Attacks