More than 100 weapons were seized and 11 persons were arrested Jan. 25 following a six-month multi-agency investigation into “ghost guns” and other illegal firearms in Westchester and Putnam Counties.

Search warrants were executed Tuesday at eight locations in Westchester and Putnam by investigators from County, local and federal law enforcement agencies. Rifles, handguns, “ghost guns” and high-capacity drum magazines were seized. Some of the weapons lacked a serial number – making them so-called ghost guns – and other weapons had defaced serial numbers. Several silencers, ballistic vests, counterfeit police shields and quantities of ammunition were also seized in the probe, dubbed Operation Casper by investigators.