Federal agents served a search warrant at a building in Pacific Beach Wednesday and took one man into custody.
Neighbors say they saw more than a dozen Alcohol Tobacco and Firearm agents and San Diego Police outside 2918 Garnet Avenue.
NBC 7 confirmed the warrant was served at a warehouse building, the same location of a SWAT standoff last month.
In that incident, a man was arrested after allegedly firing a gun at another man in some type of dispute.
Kevin McGuinness, 53, was charged April 8 with nine felonies and one misdemeanor in connection with the standoff.
The charges ranged from possession of an illegal assault rifle to making terrorist threats and resisting arrest.
He was also charged with possession of an inert grenade, which is an infraction.
The owner of a nearby business said the people using the warehouse are a nuisance.
"All the trash, the noise," the neighbor said. "It's just a big hassle is what it is."
He said there is trash, motorcycles, junk cars and tractors and other items in the lot.
"They've got a little bit of everything. Whatever you want is there," he said.
ATF agents confirmed one arrest but did not identify the man taken into custody. They also would not release information on the warrant, saying it was sealed as part of an ongoing investigation.