The tip that came into the Los Angeles County Sheriff's Department was simple: Someone suspected that a criminal in Southern California was illegally in possession of "a large arsenal of firearms."
What, exactly, constituted a large arsenal in this case? Sheriff's deputies soon discovered the answer. A team of investigators arrived at a home in Agua Dulce, an unincorporated area about 32km northeast of Santa Clarita, and searched the property.
From there, they seized 432 guns.
Deputies also arrested 60-year-old Manuel Fernandez for being a criminal in possession of firearms and ammunition.
But the trove of guns inside that home in Agua Dulce was just part of Fernandez's stash, authorities said.
As they searched the first residence, investigators obtained a second search warrant for another home about a mile away. There, deputies seized 30 more guns that illegally belonged to someone the sheriff's department described only as "a female associate."
Charges against the woman are pending, officials said.
Finally, investigators returned to the first house. Sweeping the home again, deputies found and took 91 more guns hidden throughout the house - as well as computers, cellphones and hard drives they suspected had been involved in illegal gun purchases.
In total, deputies seized 553 guns - rifles, shotguns and pistols - from Fernandez and his associate, authorities said. Photos of the haul released by the sheriff's department show the firearms piled into the bed of a Ford ute, then laid out in neat rows that covered just about the entire patio at a local sheriff's station.
"This case is a testament to the community's involvement in reducing crime and taking guns out of the hands of criminals," Los Angeles County Sheriff Jim McDonnell said in a statement. He credited the department's "See Something, Say Something" campaign with helping elicit the tip.
A recent survey of firearm ownership worldwide found that there are more guns than people in the United States - or "enough for every man, woman and child to own one and still have 67 million guns left over," as the Washington Post's Christopher Ingraham reported. Gun ownership is more heavily concentrated in fewer households, however:
"A separate Harvard-Northeastern study published in 2016 found that 3 per cent of American adults (individuals in this case, not households) own half the nation's firearms. Combined with the latest Small Arms Survey estimate, that would mean that 3 per cent of American adults own nearly one-quarter of the world's civilian firearms stockpile. It's worth noting, however, that the Harvard-Northeastern study, which was based on a survey of gun owners, estimated a much lower number of guns in circulation: 265 million as of January 2015."
Fernandez was charged with being a felon in possession of firearms, an assault rifle, ammunition and large-capacity magazines. He is out of jail on bail and next scheduled to appear in court on July 9.