Costa Rica police said Friday they had arrested four suspects in the killing on its soil of a fierce critic of Nicaraguan President Daniel Ortega in June.

Retired Nicaraguan army major Roberto Samcam, 66, was gunned down at his apartment building in San Jose on June 19 in an attack rights groups and exiled dissidents blamed on the government of Ortega and his wife and co-president Rosario Murillo.

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

A fifth suspect -- a 20-year-old named Carvajal who is believed to have pulled the trigger -- is still on the run, Randall Zuniga, director of the Judicial Investigation Agency, said in a video

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