Federal agents say the gunman in the Connecticut school shooting fired guns at shooting ranges over the past several years, but there's no evidence he did so recently as practice for the rampage.

Debora Seifert, a spokeswoman for Bureau of Alcohol, Tobacco, Firearms and Explosives, says Adam Lanza and his mother each fired at shooting ranges. They also visited ranges together.

But Seifert tells the AP that ATF investigators have no indication now "that the shooter engaged in shooting activities in the past six months."

One of the major unanswered questions has been whether Lanza trained in advance for Friday's attack that killed 20 children and six adults inside the Sandy Hook Elementary School in Newtown, Conn. Lanza also killed his mother at home and himself.