The party took place in the afternoon of Nov. 23 and early hours of Nov. 24 in La Habra Heights, Calif., the Los Angeles Times reported Wednesday.
More than 100 people attended the party where guests caused damage to the home and stole items, which amounted to at least $1 million, said Sheriff Lee Baca.
Baca called it one of the worst juvenile crimes he had ever seen.
Sixteen of the alleged party-goers were arrested Wednesday, including 13 juveniles between the ages of 15 and 17, and three 18-year-old men, Kevin Larios and Andres Uribe, both of La Habra, and Nickolas Koontz, of La Habra Heights, the Times said.
Guests went on a "looting frenzy" over the course of the night of the party, stealing medieval armor, scuba gear, Armani suits and a mounted snow leopard.
"I don't think they knew what they were doing. I don't think they knew what they had," said Los Angeles County Sheriff's Lt. Arthur Scott.
Police said they were able to track down the alleged party-goers through photos posted on social media, in which the teenagers bragged about their hauls.
The mansion wasn't being lived in by the owner, who had put it on the market for sale.
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