SANTA FE An advocacy group has countersued the state Environment Department, which last month sued to keep secret a report on possible leaks at Cold War-era mixed waste dump at Sandia National Laboratories.

Citizen Action, which is seeking the report, mailed its lawsuit to the state Court of Appeals in Santa Fe, Dave McCoy, director of the Albuquerque-based group, said Monday. It accuses the agency of violating the open meetings and open records laws.