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 remaining is whether federal intelligence officials could have done more to prevent the attacks.
Russian authorities twice alerted U.S. authorities that Tamerlan Tsarnaev and his mother, Zubeidat, may have become radical Islamists.
The two were entered into a terror related database in the United States.
"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 underway.