LOS ANGELES – The U.S. Secret Service says it has interviewed someone claiming responsibility for delivering a gift-wrapped package of horse manure addressed to Treasury Secretary Steve Mnuchin.

The box was found Saturday at the home of Mnuchin’s neighbor in the wealthy Bel-Air neighborhood in Los Angeles. The LAPD bomb squad responded to the package, which police said was marked as being from “the American people.”

Secret Service spokesman Cody Starken said Monday that the agency was contacted by Los Angeles police and interviewed a person who claimed responsibility. He declined to identify the person.

Starken said the Secret Service takes all confirmed and alleged threats seriously. He said the agency typically doesn’t comment on possible criminal investigations or interviewing practices.