Judicial police said they detained four men who are accused of at least four murders. In two cases the victims were dismembered and burned, said the Judicial Investigating Organization.
A fifth suspect already is in jail in Panamá, the agency said.
The murders extend back to February and May 2013, and they are drug related, said the judicial agency. Due to the state of the bodies, DNA tests were used to identify the victims, agents said.
The arrests came Wednesday during raids at 12 locations around Limón Centro, including Bananito, Moin, Los Lirios and Dondonia. Agents reported that they located firearms in the raids.