The attorneys general of Rhode Island and Massachusetts won't join a landmark settlement with Purdue Pharma, potentially beginning a trek down an alternative course that could entail years of litigation.

As roughly two dozens states and hundreds of municipalities signed on to the deal with the drugmaker best known for producing OxyContin, Rhode Island attorney general Peter Neronha and his Massachusetts counterpart, Maura Healey, said Wednesday they had concerns with the agreement.

Neronha was narrower in his criticism, saying he doesn't know enough about the financial assets of Purdue and the Sacklers to commit to a settlement.

"If what they’re offering is 90% of their assets, they’re feeling the pain of the damage they caused," Neronha told The Public's Radio. "But if they’re offering 10% of their assets, then I believe they haven’t. And without knowing that information, I don’t feel comfortable entering a settlement with them."

Neronha added that his office is now bringing suit against additional members of the Sackler family. Prior to Wednesday, the only member of the family Rhode Island had brought suit against was Richard Sackler, Purdue's former president.

In Massachusetts, Healey -- who has the distinction of being the first state attorney general to bring suit against an individual member of the Sackler family -- said that the settlement did not amount to "real accountability." 

"It’s critical that all the facts come out about what this company and its executives and directors did, that they apologize for the harm they caused, and that no one profits from breaking the law," Healey said in a statement. "These families deserve justice."

Roughly a dozen states declined to sign on to the settlement, among them Connecticut and New York.

Rhode Island, with an attorney general's office smaller than its neighbors, might have incentive to hash out a settlement that addresses Neronha's concerns. The alternative -- i.e. going to trial -- could be costly.

"They may have to hire outside counsel, like they did with the lead paint," says Arlene Violet, who served as the state's attorney general in the 80s. 

Still, Neronha said he is unfazed. His office is prepared to litigate, he says. 

"Far too many lives have been lost or devastated in Rhode Island as a result of the opioid crisis," Neronha said in a statement. "We are committed to continuing to aggressively pursue our claims against Purdue Pharma and the Sacklers."