Two California senators have sent a letter to Defense Secretary James Mattis seeking answers following a blockbuster investigative story by Reuters detailing substandard living conditions in military base housing.

The letter was also addressed to Tim Byrne, the CEO of Lincoln Military Housing. According to Reuters, Lincoln controls much of the base housing on Camp Pendleton, California, one of the bases mentioned in the story dealing with mice and mold infestations.

California Democratic Senators Dianne Feinstein and Kamala D. Harris said in the letter that they were “deeply concerned and disappointed about recent reports of unsuitable housing conditions at Camp Pendleton.”

In an interview with more than 100 military families, Reuters detailed decrepit living conditions and mold, mice and cockroach infestations in base military base housing.