route 91 harvest festival
Fifty-eight people died at the Route 91 Harvest country music festival last October.
A lawyer for the victims hit back at the "outrageous" lawsuit.
Lawyers for police argued authorities could not release sealed documents because they are investigating more charges.
More than 400 people are wounded after a late-night shooting at the Route 91 Harvest Festival in Las Vegas.
A gunman opened fire Sunday night at the Route 91 Harvest Festival in Las Vegas, Nevada. The shooter is 64-year-old, Stephen Paddock.
The three-day concert at the Mandalay Bay Resort and Casino included headliners Eric Church, Sam Hunt and Jason Aldean.