According to police sources, the brother of actress Julia Fox, who is known for his experimental work, was arrested after police raided his Upper East Side home and discovered ghost guns and equipment used to produce narcotics.

The NYPD’s Ghost Gun Team carried out the search warrant at the E. 84th St. apartment near Second Ave., where they found items used to manufacture pills and ghost gun parts.

The police also came across pressure cookers and chemicals that can be used in the production of explosives and illicit drugs.

During the arraignment at the Manhattan Criminal Court on Thursday, prosecutors alleged that police discovered silencers, 3-D printed magazines with large capacities, and various other materials that could be used to assemble assault-style rifles.

Police found crack and powder cocaine, heroin, oxycodone pills, and amphetamines in Christopher Fox’s bedroom, according to sources.

After the hearing, he was detained with a cash bail of $450,000.

“Upon finding those items, the Ghost Gun Team immediately called in additional resources to help investigate and seize the items,” an NYPD spokesman said. “The found chemicals were deemed non-hazardous.”

While Fox’s father and brother were apprehended, only Christopher Fox, 30, was accused. Prosecutors claim that from 2020 to January 2023, roughly $345,000 went through Fox’s CashApp accounts.

Additionally, between August 2019 and January 2023, he made over 200 requests for drug paraphernalia and chemicals commonly utilized to manufacture tablets and pills.

In a 2019 interview, Julia Fox mentioned that she grew up in Upper Manhattan with Christopher, her older brother.

“One is close in age to me, and the other one is 15,” Fox told Highsnobiety. “The 15-year-old lives in Italy with my mom, but the older one grew up with me in New York. He still lives here, but he’s not really around.

“He’s like a mad scientist recluse,” the “Uncut Gems” star added. “He builds 3-D printers for fun.”

According to the police, Christopher Fox was charged with multiple offenses such as weapons and drug possession, manufacturing a machine gun, and manufacturing a “rapid fire” weapon. Fox’s arraignment in Manhattan Criminal Court was pending as of Thursday morning.

Police sources confirmed that they do not suspect the individuals were involved in terrorism and are continuing their investigation. A spokesperson for the NYPD said that the raid was part of a long-term investigation into ghost guns and narcotics.

“The NYPD will continue to fight relentlessly against illegal guns – against both the steady proliferation of traditionally-manufactured firearms and the increasingly prevalent numbers of illegal, untraceable but fully functioning weapons known as ghost guns,” the spokesman said.

Born in Milan, Italy, and raised in both New York and Italy, 33-year-old Fox began her career as a model and fashion designer before transitioning to acting. She made her debut in the Netflix film “Uncut Gems” alongside Adam Sandler.

Fox’s fame increased last year after she briefly dated Kanye West following his high-profile split from Kim Kardashian. However, their whirlwind romance came to an end after West’s controversial social media posts about Jews cost him millions in collaboration deals with clothing manufacturers.

According to Fox’s TikTok account, the purpose of their relationship was to “get him off of Kim’s case.”

“That month that we spent together, he wasn’t on Twitter … he wasn’t on any form of social media,” she said. “The moment he started tweeting, I was out. … And also, I realized pretty quickly that he wasn’t gonna take my help.”

According to recent reports, an airplane mechanic from Queens was arrested by NYPD detectives last week for possessing a significant number of untraceable, high-powered ghost gun kits, which included semiautomatic pistols, assault rifles, and silencers.

The accused, Grzegorz Blachowicz, was charged with 131 counts after he was found with an assembled assault rifle and 19 kits to manufacture polymer-based, unserialized firearms. The weapons were reportedly stored in his parents’ backyard in Glendale.