The man who opened fire from a D.C. apartment Friday, wounding four people before dying of an apparent self-inflicted gunshot wound, had a major stockpile of weapons and ammunition in two apartments he was renting, police said Monday. No one was killed in the shooting, but two people remain hospitalized in critical condition, officials said.

Police recovered six guns, three of which were fully automatic, in the apartment that the shooter — identified as 23-year-old Raymond Spencer — was firing from. Metropolitan Police Chief Robert Contee said Spencer fired more than 200 rounds during the shooting, and more than 800 unused rounds were found in the apartment.

In another of Spencer’s apartments — this one in Fairfax, Virginia — authorities found three more guns and “thousands” of rounds, Contee said.