(CNN) Three suspects have been arrested and explosives and other weapons have been seized over an alleged plot to destabilize Ghana's presidency, the country's minister of information said Monday.

Security forces in the West African nation had been monitoring the suspects' activities for more than a year before their arrest Friday, Information Minister Kojo Oppong Nkrumah said in a statement.

"The joint operation was to neutralise an elaborate plot targeted at the presidency, and with the ultimate aim of destabilising the country," Nkrumah said in the statement, which was posted to Twitter and confirmed to CNN by his deputy, Pius Enam Hadzide.

The suspects are being questioned as the investigation continues, Nkrumah said. They have not yet been arraigned and are in the custody of a joint security task force comprised of members of the country's Defense Intelligence Department, Criminal Investigation Department and Bureau of National Investigations, Hadzide said.

The arrests come a year ahead of presidential elections in Ghana, with incumbent Nana Akufo-Addo expected to seek another term. Recent elections have been peaceful.

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