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Hochman said the weapon Sepulveda allegedly used was a so-called “ghost gun,” which did not have a serial number.

Police said that when they found Mr Mangione, he was in possession of a ghost gun - a gun assembled from untraceable parts - a fake ID, a passport and a handwritten document indicating "motivation and mindset".

Detectives also found over $2,000 in cash and a loaded handgun without a serial number, known as a “ghost gun.”

Gun makers and retailers were barred in a recent court ruling from selling ghost gun kits and firearm precursor parts in California.

Authorities seized roughly 7,600 firearms last year, and said one out of every 10 was an unregistered “ghost gun.”