The prosecutor leading the investigation into last year’s massacre at Sandy Hook Elementary School said he will ask Connecticut’s courts to block the release of 911 tapes from the shooting by appealing a state Freedom of Information Commission decision.

The commission on Wednesday ruled in favor of The Associated Press, which sought access to records withheld by investigators. The recordings will not be made available immediately as Danbury State’s Attorney Stephen Sedensky III said the decision will be appealed in Superior Court.