HOLMBY HILLS, LOS ANGELES (KABC) — Federal agents and Los Angeles police seized hundreds, possibly thousands, of firearms after executing a search warrant at a home in the Holmby Hills neighborhood.

ATF agents were seen in the area of Sunset Boulevard and Beverly Glen sorting through and documenting the collection of weapons.

Many of them appeared to be rifles.

The ATF didn't provide details, but said the operation was part of an ongoing investigation with the Los Angeles Police Department.

Holmby Hills is a small, wealthy neighborhood in the hills northeast of UCLA that is perhaps best known as the home of the Playboy Mansion.

DEVELOPING: This story will be updated.