A family is suing the Marine Corps and other Defense Department agencies alleging a coordinated, illegal effort to suppress details about the insider attack that claimed the lives of their son and two other Marines in Afghanistan, the Marine Corps Times reported Friday.

The lawsuit, filed in federal court Wednesday by the family of Lance Cpl. Greg Buckley Jr., seeks the release of investigative materials and autopsy results connected to the 2012 murders, which were carried out by an Afghan teenager in the Garmsir district of Helmand province.