Costa Rica police have arrested four suspects in the assassination on its soil of a fierce critic of Nicaraguan President Daniel Ortega in June, an official said Friday.

Retired Nicaraguan army major Roberto Samcam, 66, was gunned down at his apartment building in San Jose on June 20.

Nicaraguan rights groups and exiled dissidents blamed the government of Ortega and his wife and co-president Rosario Murillo.

Costa Rican police carried out several raids since Thursday in an area of San Jose where many Nicaraguan migrants live, as well as a town northwest of the capital, arresting four people in all.

"We have an individual with the last name Carvajal, 20 years old, who is believed to have committed the homicide," Randall Zuniga, director of the Judicial Investigation Agency, said in a vi

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