An initial five-point surprise lead for the challenger from the leftist Libre alliance steadily dwindled since the first results were reported early Monday and slipped away entirely by Wednesday evening.
With 83 per cent of the votes tallied, Hernandez had a marginal advantage of 42.21 per cent to 42.11 per cent for Nasralla, according to the latest returns posted on the electoral court's website.
A long pause in updated returns that followed the initial report of Nasralla's lead has fed suspicions among his supporters.
"The government doctored the electoral ballots, but I will defend the votes anywhere," Nasralla said without offering specific evidence of manipulation.
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He called on the 500 international election observers in the country to form a special commission to investigate. "Or else Hernandez will steal the victory, and I won't tolerate it," he said.
He and Hernandez have claimed victory since Sunday's vote.
Thousands of flag-waving opposition alliance supporters marched down two central boulevards in the capital today heading for the electoral court facilities where the vote count was under way.
Sonia Garcia, who works in a store in one of Tegucigalpa's malls, called for Hernandez to resign "for our country's peace."
US State Department spokeswoman Heather Nauert urged the candidates to respect the official results once they are available.
"We await the final tabulation of results by election authorities and urge the authorities to complete their work without undue delay," Nauert said today. "The United States urges calm and patience as the results are tabulated."
An election observation mission from the Organisation of American States has urged calm. Rumours circulated Tuesday that the military was positioning troops throughout the country, but the government responded that the convoys of military trucks seen on highways were transporting election materials.
The European Union's election observation team criticised the electoral court Tuesday over the delay in releasing results. Later, the court announced that results would be available tonight instead of tomorrow as it had previously said.
Nasralla and supporters of the opposition alliance are sensitive to any whiff of election shenanigans. It was Hernandez's National Party that orchestrated the coup that removed President Manuel Zelaya from office in 2009.
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