Namibia's ruling SWAPO party led both the presidential and parliamentary races on Tuesday, a week after voting took place in an election marred by technical challenges.

SWAPO, which has governed the southern African nation since leading it to independence from apartheid South Africa in 1990, fielded Vice President Netumbo Nandi-Ndaitwah as its presidential candidate. If victorious, she would become Namibia's first female leader.

Results were initially expected a few days after the November 27 poll, but voting was extended to November 29 and November 30 at several polling stations after some voters were unable to cast their ballots on election day due to technical difficulties and ballot paper shortages.

At 0636 GMT, the electoral commission's election portal showed Nandi-Ndaitwah was leading the presidential race with 54.82% of the vote after 65.57% of votes had been counted.

To win the presidency, a candidate must secure over 50% of votes, failing which a run-off is required.

Namibians vote separately for members of the National Assembly, and SWAPO led the ballot with 56.38% of the 66.39% of the votes tallied.

Opposition candidate Panduleni Itula and his Independent Patriots for Change trailed a distant second, with 28.09% of the presidential vote and 19.23% of the vote for the National Assembly.

The timeline for the final result announcement was unclear.