Fuerza Pública officers detained four men Thursday as suspects in robbing a student and also in an attempt to rob a car from its driver.
Police said one of the suspects had been released by a judge on conditional liberty after being convicted of an earlier robbery.
The arrests happened in San Juan de Santa Bárbara de Heredia. They were detained in San Pedro de Barva.
Police said they recovered a .22-caliber pistol that had been thrown into a vacant lot. The four also are being investigated regarding four similar incidents in the past days.
The four were identified by the last names of Martínez Morales, Sanabria Araya, Walter Thompson and Gómez Molina. Police said that Gómez was the man who had been granted conditional liberty.