HONOLULU -- Motorcycles and illegal firearms were stolen, altered and resold in what police and prosecutors described as a well-organized theft ring.

Investigators said there are at least 100 victims.

Police said it's one of their longest investigations that started a year-and-a-half ago when a victim saw his stolen motorcycle for sale on Craigslist.

The results of a raid of Twins Auto Body shop in Waipahu were displayed back in January of last year when police busted the theft scheme.

Seven people have been indicted, including twin brothers, Thang and Toan Nguyen, both 26, who co-owned the auto body shop.

Also named in the indictment were the brother's girlfriends, Frances-Nicolette Freitas, 25, and Tiffany Nakata, 24 along with three other accomplices, , Freddie Woods-Vierra, 22. While named in the indictment, Micah Reichman, and Ali Nguyen have not yet been arrested or charged in connection with the case.

Prosecutors said the scheme started with stolen motorcycles on Oahu, almost all of them sport bikes.

They said a motorcycle frame with the title was purchased from a mainland salvage dealer to match the make and model of a stolen bike.

Prosecutors said the defendants then ground off the vehicle identification number on the stolen motorcycle and replaced it with a false VIN from a salvaged motorcycle along with fake Hawaii safety check applications and decals.

The mainland title was then transferred to one of the suspects or a fictitious name; then it was sold on Craigslist, officials said.

Police said the victims lost more than a half-million dollars in property during a two-year period.

According to DMV records, the defendants had no less than 13 motorcycles each registered in their names; Toan Nguyen had 39, and Micah Reichman had 40, for a total of 136 motorcycles.

Investigators said the scheme had been going on for at least three years.

Five of the defendants have been charged with multiple felonies including first- and second-degree theft, racketeering, money laundering, conspiracy and tampering with a government record.

Honolulu police said they've been able to contact all but a handful of owners. Of those, they said the owners have either moved away or are difficult to track down.