Ivory Coast's main opposition party on Sunday claimed victory in legislative elections in the West African nation, alleging that preliminary results were riddled with irregularities.

"We think we have around 128 seats with our allies" in the 255-seat National Assembly, top party official Niamkey Koffi told a news conference in the economic capital Abidjan the day after the polls.

Ivory Coast's independent electoral commission has issued partial provisional results
Ivory Coast's independent electoral commission has issued partial provisional results AFP / SIA KAMBOU

"Our concern is that the results may be manipulated," said Koffi of the centre-right Ivory Coast Democratic Party (PDCI), warning the government against "any attempt to falsify" them.

The statement came after the independent electoral commission announced early provisional results, which Koffi said were "strewn with fraud, tampering and manipulation".

Map of Ivory Coast
Map of Ivory Coast AFP / Laurence SAUBADU

Saturday's elections were a key test of stability four months after the violence before and after a presidential vote claimed 87 lives in the former French colony.

Koffi alleged attempts to reverse results in several large cities including the political capital Yamassoukrou, the coastal resort of Grand-Bassam, and key districts of Abidjan.

I.Coast parliamentary elections: polls close and vote counting begins in Abidjan
I.Coast parliamentary elections: polls close and vote counting begins in Abidjan AFPTV / Evelyne AKA

Turnout had been a mere 20 percent, he added, citing "fear of violence".

The PDCI, in an unprecedented move, forged an election alliance with the centre-left coalition Together for Democracy and Solidarity (EDS), whose driving force is the Ivorian Popular Front (FPI) of former president Laurent Gbagbo.

Their declared aim is to prevent President Alassane Ouattara and his RHDP party from "consolidating absolute power" in the world's top cocoa grower, formerly a haven of peace and prosperity in troubled West Africa.

In the last legislative vote in December 2016, the RHDP and PDCI were allied, winning an absolute majority with 167 seats.

Last year's crisis shattered that deal.

Abidjan Mayor Sylvestre Emmou, an opposition candidate, said that three people had been stabbed and injured in the economic capital on an otherwise calm day of voting. Election observers reported no other major incidents.