The state's attorney on Thursday would not give a time frame for the investigation of the
A spokeswoman from the Connecticut State Police said that department is not giving out a timeline either.
While the shooter is dead, investigators are trying to determine if anyone knew Lanza had planned the assault.
Sedensky would not talk about the investigation, which he said involves the state police, Newtown police, the Office of the Chief Medical Examiner and other local and state agencies, along with federal investigators.
"It cannot be stated too often how invaluable and necessary the work of the United States Attorney's Office, the
In a phone interview, Sedensky said, "I have just been so pleased with the cooperation of all the agencies since day one."
He said he issued the statement "just to kind of clear up, procedurally, what we're doing." He said doesn't want to imply that any arrests are expected.
"At the same time, I can't say absolutely not," Sedensky said. "I can't say absolutely not because I have to see the whole investigation."
There already has been an arrest in a related matter. A New York woman accused of pretending to be related to a young victim of the shooting and seeking donations through Facebook was arrested by federal authorities.
And federal firearms inspectors examined business records at the
Sources said she bought one of several weapons she owned at the shop, Riverview Gun Sales, but the federal government's interest in the store grew out of events that are not related to the purchase.
Her guns appear to have been purchased legally and registered properly, the sources said.