President Joe Biden will announce new federal regulations on Monday to rein in the use of untraceable firearms known as ghost guns that law-enforcement officers say are turning up frequently at crime scenes across the country.

The new rules, which Biden and Deputy Attorney General Lisa Monaco will announce during a Rose Garden ceremony, will target privately made firearms that can be assembled from do-it-yourself kits purchased online or in a store. The weapons contain no serial number, which makes it difficult to trace the owner.

Senior administration officials, who briefed reporters ahead of Biden’s announcement, said Sunday the new rules will clarify that the unfinished parts sold in the kits, such as the frame of a handgun or the receiver of a long gun, will qualify as firearms under federal law.

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