Boston Police Commissioner Ed Davis sat with "60 Minutes'" Scott Pelley to discuss the rapid response to the Boston bombing. They identified the Tsarnaevs as suspects by isolating "people who didn't seem surprised" in camera footage of the scene.
The program also interviews friends of the Tsarnaev brothers:
Prachi Gupta is an Assistant News Editor for Salon, focusing on pop culture. Follow her on Twitter at @prachigu or email her at email@example.com.