Bombing survivor Jarrod Clowery told a news conference how impressed he was by the first responders who helped him and so many others and how coordinated they were -- even better than the best drive by New England Patriots quarterback Tom Brady.
"No disrespect to Tom Brady, I love him, but he can't hold a candle to [those] people," he said.
One of the biggest questions is whether federal intelligence officials could have done more to prevent the attacks.
"Based on what I can see so far, the FBI performed its duties. The Department of Homeland Security did what it was supposed to be doing," President Barack Obama said this week. "But this is hard stuff."
An independent review by the Intelligence Community inspector general is under way.
James Clapper, the director of national intelligence, believes that all of the agencies involved in collecting and sharing information about Tamerlan Tsarnaev "took all the appropriate steps," Clapper spokesman Shawn Turner said.