A drug ring that allegedly mailed packages of cocaine from Puerto Rico to Worcester, Fall River and Taunton allegedly concealed the drugs inside PlayStation video game systems to avoid detection, according to a federal search warrant affidavit.

Ten people, including six residents of Massachusetts, were hit with federal drug conspiracy charges in May, the Office of Massachusetts U.S. Attorney Andrew Lelling announced at the time.

The alleged scheme was detailed in an application filed Tuesday in U.S. District Court to search a mailed package. The drug traffickers allegedly used the U.S. Postal Service to mail large quantities of cocaine to distributors in Massachusetts, who mailed thousands in cash back to Puerto Rico to pay for the narcotics.

"Specifically, [confidential source] CS-1 told law enforcement officials that the [drug trafficking organization] packages controlled substances in PlayStations," U.S. Postal Inspector James Foley wrote in an affidavit. "CS-1 is believed to be reliable because law enforcement officials have been able to verify, to the extent possible, the information provided by CS-1."

The arrests are the result of a two-year investigation by the Drug Enforcement Agency, Massachusetts State Police and Postal Inspection Service, Foley wrote. Over 25 packages have been mailed from Massachusetts to a P.O box in Caguas, Puerto Rico that federal investigators believed is controlled by the drug trafficking organization.

Search warrants on other packages have already led to the seizure of mass quantities of cocaine, according to the affidavit. One package revealed three kilograms of cocaine concealed inside three different PlayStations; another package sent to a woman in East Taunton contained a kilogram of cocaine in yet another PlayStation.

Packages sent the other way, from Massachusetts to Puerto Rico, contained thousands in cash, according to the affidavit. One package searched by federal investigators found $12,000 that had been vacuum-sealed, wrapped in carbon paper and hidden in baby toys.

While charges have already been filed against ten people in the case, federal authorities are now seeking to search another package that may contain money used to purchase drugs.

In October of last year, investigators began tapping the suspects' phones. On April 27, just days before her arrest, Worcester resident Tina Rodriguez was allegedly caught complaining that a package containing thousands in drug payments had been accidentally sent to California.

"Listen, [on] March 20, I sent out about $15,000. That s--- is MIA ... Then a couple of days ago, I sent out about $13,000. The s--- ended up in California," Tina allegedly said.

A postal clerk at a Worcester post office contacted Foley and told him that a woman believed to be Rodriguez had come in that day complaining about the non-delivery of a package to Puerto Rico. Federal authorities found the package had been wrongly shipped to California, and instructed postal workers there to return it to Massachusetts.

"I believe that there is probably cause to believe that the subject package described above contains proceeds from the sale of controlled substances (such as cash or money orders) or other documents constituting evidence of the target offenses," Foley wrote.

The ten people charged in May were Tina Rodriguez, 45, of Worcester; Samuel Rodriguez, 59, of Taunton; Pedro Oyola, 33, of Cayay, Puerto Rico; Jose Santos, 47, of Fall River; Edgar Rios-Lopez, 38, of Naranjito, Puerto Rico; Luis Elias, 43, of Worcester; George Torres, 41, of Taunton; Debra Demoranville, 49, of Taunton; Angel Oyola, 35, of Caguas, Puerto Rico; and Ricardo Zayas Ramos, 21, of Pawtucket, R.I..