Developing: Suffolk County district attorney says investigators are wrapping up at the suspected Gilgo Beach serial killer's home and have a 'massive amount of material' to analyze.
Investigators have been Suffolk Police Commissioner Rodney Harrison confirmed the existence of a walk-in basement vault with a large iron door.
"There's not a soundproof room. There is a vault where he secured numerous amount of guns," Harrison said Monday.CBS New York's Carolyn Gusoff will have more details from the district attorney's briefing on CBS2 News at 5 and 6.
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