Roca, president of the Social Democratic Party; Roque, director of the Cuban Institute of Independent Economists; Bonne, president of Cuban Civic Mainstream; and Gomez, president of the independent lawyers group Agramontist Mainstream, are members of the Domestic Dissidence Working Group.
They were arrested at their homes July 17 and taken to Villa Marista, headquarters of the state security agency, where they remain. So far, no formal charges have been pressed.
Foreign Ministry spokesman Miguel Alfonso sent a message Wednesday to several embassies in Havana, after representatives of the European Union and Canada met with Cuban officials Friday and expressed concern over the arrests.
At a press conference in June for foreign journalists, the activists made public a document in which they proposed peaceful changes leading to democracy.
The document, The Homeland Belongs to Everyone, was in response to the draft manifesto of the Fifth Congress of the Cuban Communist Party, to be held in October.
Alfonso told the diplomats Wednesday that the activists were detained for committing counterrevolutionary crimes. They carried out ``intense activities aimed at subverting the republic's legal and constitutional order,'' his note said, and were in contact with ``leaders of terrorist groups set up on United States territory.''
The alleged threat to foreign investors is reportedly based on a letter the four dissidents sent to European firms in Cuba in February, asking them to respect the rights of workers.
The charge of lying about the Cuban economy reportedly was made against Roque, who made several analyses -- based on official government statistics -- and predicted the failure of the recent sugar harvest.
The alleged plot to disrupt elections is said to be a call the activists made to the Cuban population to refrain from voting in the next elections.
Tony Santiago, a Working Group coordinator living in Miami, rejected the government's allegations and said they were made to justify internal repression.
President Fidel Castro ``knows that none of the four are terrorists because they've always sought transition through dialogue. They neither call for subversion nor foster it,'' he said.
The Rev. Francisco Santana said in Miami that the Roman Catholic Church in Cuba is trying to gain the detainees' release through unofficial, private channels.
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