The state's attorney on Thursday would not give a time frame for the investigation of the Sandy Hook Elementary School massacre.
But Danbury State's Attorney Stephen J. Sedensky III said he will continue to work with local, state and federal agencies on the criminal probe and decide, when the final report is done, if there will be any arrests.
A spokeswoman from the Connecticut State Police said that department is not giving out a timeline either.
Adam Lanza fatally shot 20 students and six staff members before killing himself during a Dec. 14 rampage at the Newtown school. He had earlier shot and killed his mother at their home.
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 Federal Bureau of Investigation, the United States Marshals Service, the Bureau of Alcohol, Tobacco, Firearms and Explosives and other federal agencies was and is to this investigation," Sedensky said in a written statement emailed by the Chief State's Attorney's Office.
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 East Windsor gun shop where Nancy Lanza, Adam Lanza's mother, bought a weapon. Authorities said Adam Lanza used a Bushmaster .223-caliber semiautomatic rifle purchased by his mother; three law enforcement sources said Nancy Lanza had bought the Bushmaster rifle at the East Windsor store.
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.
No arrests stemming from the gun shop investigation have been announced.Copyright © 2015, CT Now