By Diego Oré

SAN JOSE/MEXICO CITY, (Reuters) -One night last November, four carloads of armed Nicaraguan police pulled opposition figure Henry Briceno and his family out of their home and deposited them at a checkpoint on the border with Costa Rica.

Seven months after the Bricenos were expelled to Costa Rica, the family was packing its bags again.

Unknown men, travelling by motorcycle or in unmarked cars, had been following Briceno. And Briceno started to fear that he could be the latest Nicaraguan political exile to be killed in Costa Rica, he said in an interview with Reuters.

The Nicaraguan opposition figure, Roberto Samcam, had told fellow Nicaraguan exiles and Costa Rican police the same thing was happening to him in the days before he was shot dead inside his house in San Jose on

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