The authorities in Guinea have cordoned off the home of one of the leaders of the opposition National Front for the Defence of the Constitution (FNDC), the party has said.

The FNDC says in a Facebook post that the access to the home of its national coordinator, Abdourahamane Sano, has been closed off by the police.

This comes ahead of planned protests on Tuesday against President Alpha Conde's bid for a third term in October's election.

The FNDC, an alliance of civil society groups and opposition parties, has rejected Mr Conde's candidacy and vowed that the protests will take place despite a government ban.

"Fearing the magnitude of citizen mobilisation for the FNDC march, which is planned for the Fidel Castro Motorway on 29 September, Alpha Conde has taken the decision to prohibit this demonstration against his third mandate," the alliance said.

Although the FNDC had called for boycott of the polls, at least 11 opposition candidates will face off against 82-year-old Conde in the 18 October election.

The latest round of protests will be a key test of the FNDC's mobilising power after the group parted ways with several allied political parties over their participation in the presidential election.