Thirty-three were named in an alleged fraud case.

Authorities in San Francisco arrested 15 people and had arrest warrants for 17 others connected with First International Trading Co., a company they say defrauded 2,500 investors of nearly $18 million by selling precious metals it did not possess. The 33rd suspect is already in prison for violating his parole in a similar case, they said. First International had offices in Irvine until the Commodity Futures Trading Commission took action against it in February, obtaining a federal court order placing it in receivership.