The rescue Limón campaign that began Monday has netted 15 persons as of midday Tuesday.
The security ministry detailed 260 more officers to the area around the central canton in places such as Cieneguita de Limón, which they characterized as highly violent.
There have been more than a dozen murders in Limón since the first of the year. That statistic prompted the action.
So far, police said they confiscated three 9 mm pistols, and in one case 482 grams of marijuana. Officers set up a police checkpoint on the central street of Limón. Some of those detained were in the country illegally.
Police said 10 persons were detained Monday and five by midday Tuesday.