After two not guilty pleas Thursday, the eight men and one women snared in a federal probe into corruption in Prince George’s County have all told the court they’re innocent of the charges against them.

The public, meanwhile, still doesn’t know exactly what three of them are accused of.

On Thursday, Prince George’s County police officer Sinisa Simic, 25, of Woodbridge pleaded not guilty in federal court in Maryland to charges of conspiracy to distribute cocaine and the use of a firearm to further drug trafficking. Mirza Kujundzic, 30, of Woodbridge, Simic’s alleged partner-in-crime, entered a not guilty plea Wednesday.

But charges against the two other men who entered pleas in the past two days are more mysterious. Amir Milijkovic, 39, and Chun Chen, 34, both of Bowie, pleaded not guilty to "conspiracy to interfere with commerce by extortion under color of official right."

They’re accused of participating in an alcohol-and-tobacco smuggling ring that brought untaxed liquor and cigarettes from Virginia into Maryland, but the indictment doesn’t make clear what role either played in the ring.

In court appearances, prosecutors haven’t shed new light on what roles Milijkovic, Chen or Jose Moreno, a 49-year-old defendant from Alexandria, allegedly played in the scheme they’re charged in. Moreno entered a not guilty plea Nov. 23.

The indictment outlines the basics of the plot: Two Prince George’s County  officers, Sgt. Rich Delabrer, 45, of Laurel and Cpl. Chong Chin Kim, 42, of Beltsville, provided protection for the ring. Amrik Melhi, 51 of Clarksville, who owns a string of liquor stores in the Free State, provided bribes to Delabrer. Prosecutors have also said Melhi discussed bribing public officials with his wife, Ravinder Melhi, 49, also of Clarksville. She is also charged in the scheme. All have entered not guilty pleas.

But beyond their names, Milijkovic, Chen and Moreno are barely mentioned in the 8-page indictment. Milijkovic is said to own an auto glass store in College Park, but the store isn’t among the dozens of properties, vehicles and bank accounts the government seeks to seize in the indictment. The indictment says all of the properties were either obtained as a result of the conspiracy or were used to commit the conspiracy.

Clarity won’t have to wait for too long. U.S. Magistrate Judge Jillyn K. Schulze has set a Dec. 10 deadline for motions and has scheduled a jury trial to begin Jan. 18.