Dzhokhar Tsarnaev was taken into custody after authorities rushed the boat, Davis said.
In separate interviews, the parents of the Tsarnaev brothers said they believed their sons were incapable of carrying out the bombings.
“Somebody clearly framed them. I don’t know who exactly framed them, but they did. They framed them and they were so cowardly that they shot the boy dead,” father Anzor Tsarnaev said in Dagestan’s provincial capital, Makhachkala.
“It’s impossible, impossible, for both of them to do such things, so I am really, really telling that this is a setup,” the brothers’ mother, Zubeidat Tsaraeva, told CNN in English.