A Long Island man was arrested early Thursday morning when local police discovered swastika flags, a framed portrait of Adolf Hitler, and bomb-making instructions inside his home during a warranted search, according to a press release from the Suffolk County police department.

Police say Edward Perkowski, 29, was also stockpiling guns and ammunition—a .40-caliber Glock and six assault rifles, as well as four rifles, 25 high-capacity magazines, a shotgun, a stun gun, and 5,000 rounds of ammo. Less sinister findings allegedly included 26 grams of mushrooms, four ounces of weed, and $42,940 in cash.

Fourteen knives were also allegedly recovered from the Mount Sinai home, at 22 Miller Place Middle Island Road.

The bomb-making instructions, some of them handwritten, were stacked in a black binder, ABC reports. According to CBS, the binder also contained a "racist manifesto."

"Today's search warrant might have prevented a deadly, violent incident, like the one we recently saw in Orlando," Suffolk County police commissioner Timothy Sini told reporters on Thursday, after the 6:00 a.m. raid.

Perkowski has been arrested on various criminal weapon and drug possession charges. He lives with his brother, 25-year-old Sean Perkowski, who was arrested on an outstanding bench warrant. The town of Brookhaven has condemned their house for safety violations.

Neighbors told ABC that they had been making complaints about the Perkowski house for some time, suspecting drug activity. "The house has been a known house," neighbor John Leonard told reporters, adding, "the police are there every couple of months."

Attorney Matt Tuohy, representing the older Perkowski, told the outlet that his client owns a legitimate military surplus business. Tuohy, who plans to fight the charges, did not immediately respond to a request for additional comment.

The Perkowski brothers will be arraigned in Central Islip this afternoon.