A no guns allowed sign is posted at the 54th Street entrance to the New York Hilton Midtown Hotel in New York, where Brian Thompson, the CEO of UnitedHealthcare, was fatally shot last week.

Police say the suspect had a ghost gun, possibly made with a 3D printer, when he was arrested on Monday. Here’s what to know about the increasingly widespread weapons and efforts to regulate them.

(Image credit: Ted Shaffrey)

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