Hundreds of people gathered in Oklahoma City on Monday to mark the fifteenth anniversary of the bombing of the Alfred P. Murrah Federal Building that killed 168 people and wounded over 600 others. Homeland Security Secretary Janet Napolitano addressed a crowd that included survivors of the attack and relatives of the dead.

Homeland Security Secretary Janet Napolitano: “We honor the continued need for vigilance against the violent ideologies that led to this attack, so that we can recognize their signs in our communities and stand together to defeat them. And above all, we remind ourselves that what defines us as a nation, as a people and as communities is not what we have suffered but how we have risen above it, how we have overcome.”