State officials have released a long-awaited report on last December’s Newtown Elementary School shooting, which concludes that the 20-year-old Adam Lanza acted alone when he fatally shot his mother at their home in Newtown and then went to the elementary school where he fatally shot 20 first-grade pupils and six adults and wounded two other adults.

“The purpose of the investigation was to determine what crimes had been committed and whether anyone will be prosecuted as a result of those crimes. Based on a painstaking investigation it is determined that there will be no arrests or prosecutions. The Connecticut State Police are to be commended for their tireless work on this investigation and their consideration of the families and victims involved,” said the report’s author, Danbury State’s Attorney Stephen Sedensky III.