Vance said investigators will work through the holidays "dissecting the shooter from the day he was born to the day he died."
"We spent countless hours going through every stitch of that house we could uncover," Vance said.
Rep. Joe Courtney, D-Conn., said "the hunger for information" about the Lanza family and Adam Lanza's motive is "overwhelming" around the state.
But Courtney, a former public defender who represents eastern Connecticut, said elected officials and residents remain confident that police and federal officials are working as fast as they can, "given the fact some of the key witnesses lost their lives."
"I have some understanding how difficult it is to piece something like this together," Courtney said. "They want to be careful about not making bad conclusions. . . . This is about as large as it gets, so I still give them some slack and time."