NATIONAL NEWS (CNN) — Relatives of the victims of the Sandy Hook Elementary School shootings have been briefed about documents to be released Thursday in the case, but the new information may not reveal what led Adam Lanza to go on a shooting spree last December, police said.
The documents may contain new information but perhaps no big surprises, said Paul Vance, a spokesman for Connecticut State Police.
Some of the documents, to be released by state prosecutors, have been redacted at the prosecutor's request, Vance said.
State police are continuing their investigation, which is not expected to be completed until June, he said.
The killings have led Connecticut legislators to re-examine the state's gun laws, which are among the nation's strictest, and have reopened a national debate on gun control.
U.S. Sen. Richard Blumenthal, D-Connecticut, has announced plans to introduce legislation requiring background checks to purchase ammunition. He has pressured members of his state legislature to take action to bolster his efforts on a national level.
On December 14, Lanza, 20, took guns belonging to his mother, Nancy, and shot her as she slept in her bed. Then he went to the school in Newtown, Connecticut, where he gunned down 20 children and six staff members before killing himself.