“We will find out who did this. We’ll find out why they did this. Any responsible individuals, any responsible groups, will feel the full weight of justice.”

President Obama

“I’m as baffled and confused and upset as everyone. Thank God my family is all here.”

Joan Benoit Samuelson

“This is something I’ve never seen in my 25 years here … this amount of carnage in the civilian population. This is what we expect from war.”

Alisdair Conn

Massachusetts General Hospital’s chief of emergency services

“It was pretty terrifying. I think people knew immediately it was some sort of violent act.”

Bryan Gattis

runner from Falmouth who lives in Cambridge, Mass.

“This is a terrible day for all Americans, but we will carry on in the American spirit, and come together with grace and strength.”

U.S. House Speaker John Boehner

“It’s really sad to see something like this happen at such a great event. To me, as a runner, it’s mind blowing anybody would do this.”

Louis Luchini

Maine state representative from Ellsworth

“It was absolutely like a war scene.”

John Mixon

Run for the Fallen Maine

“This stuff is more like Baghdad and Bombay than Boston.”

Bruce Mendelsohn

former Army medic who works at the Massachusetts Institute of Technology

“You’re so happy and excited to finish. … You get your medal. You get your Gatorade and — boom.”

Tracy Eaves

runner from Michigan