Downtown Boston After the Marathon Bombing

It's a beautiful spring day in Boston but while the trees have started to bloom and runners are milling around the streets with their medals, there's still an air of uncertainty and sadness.

"9/11 taught us many things, but one of the key trainings is this notion called all-hazards training," said Kayyem. "You can train for the blisters and you can train for the dehydration and exhaustion and in a moments notice turn it into a casualty unit."

Near the scene of where the marathon bombings took place Werman also spoke with longtime foreign correspondent Dina Kraft about her experience covering bombings in Israel and now here in Boston.

"That's what Israelis live with, that sort of contrast with normal-life-goes-on and mourning at the same time and what it creates in Israel is a much more intense understanding of the value of life and to live life to it's fullest and that's what I've heard those sort of comments from Bostonians today," said Kraft.