The two front runners in Honduras' presidential election are still neck and neck as the vote count enters its fourth day.

With just over 84% of the votes counted, conservative candidate Nasry Asfura - who has the backing of US President Donald Trump - moved ahead of centrist TV presenter Salvador Nasralla, but the difference between the two is minimal at just 0.3 percentage points.

The vote count has been delayed twice by technical outages, which electoral officials called "inexcusable".

The electoral council has urged Hondurans to be patient and police have increased security around the hotel where the votes are being tallied.

Election officials could not contain their anger when the count ground to a halt again for several hours on Wednesday.