The same company that investigated alleged Navy Yard shooter Aaron Alexis for his security clearance also did a 2011 follow-up investigation of Edward Snowden, the former NSA systems analyst who leaked documents about the National Security Agency.

The company, USIS, said in a statement Thursday it conducted Alexis’ background check in 2007 for the Office of Personnel Management but that it couldn’t elaborate.

“Today we were informed that in 2007, USIS conducted a background check of Aaron Alexis for [the Office of Personnel Management],” spokesman Ray Howell said. “We are contractually prohibited from retaining case information gathered as part of the background checks we conduct for OPM and therefore are unable to comment further on the nature or scope of this or any other background check.”