TEGUCIGALPA, Honduras (AP) — Thousands of people marched peacefully Sunday in Honduras' capital to support opposition presidential candidate Xiomara Castro in her claim that last weekend's election was fraudulent.

The electoral court has declared conservative Juan Orlando Hernandez of the ruling National Party as the winner. The court said that with 96 percent of ballots counted, Hernandez had 37 percent and Castro was second with 29 percent. Six other candidates shared the remaining votes.

Both Castro and her husband, former President Manuel Zelaya, who was ousted by a coup in 2009, led the protest march from a pickup truck carrying the body of a militant of their Libre Party, who was shot to death hours before the demonstration began.

"We are here to denounce the culture of death promoted since the coup, this can only be a political crime," said Zelaya, whose removal from office has left Honduras polarized.

Libre Party supporter Jose Ardon was kidnapped late Saturday and was found shot to death hours later. He was leader of a group known as the "the motorcyclists," motorcycle riders who have led all marches in support of Zelaya and his wife since the coup.

Zelaya is calling for a vote-by-vote recount and says that as head of the Libre Party he will file a formal complaint with the electoral tribunal Monday.

"If the vote recount is not done by Friday, the legal deadline, we will legally challenge the election," Zelaya said outside the electoral tribunal's warehouse where the vote count is taking place. Libre Party supporters put Ardon's coffin outside the building while Zelaya spoke.

"If they do not accept our complaint, we will go to the courts, and if the courts don't take our case, we will go to international bodies," Zelaya said.

Castro alleges tally sheets were altered, dead or absent people were included in the voter registry, and inadequate monitoring of polling stations allowed for election fraud.

Late Friday, Castro, 54, called the election "a disgusting monstrosity that has robbed me of the presidency" and said she would not recognize Hernandez's government.

Hernandez has said his victory is legitimate and he won't negotiate. He hasn't comment directly on the fraud allegations.

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  • Juan Orlando Hernandez

    National Party presidential candidate Juan Orlando Hernandez arrives to give a press conference in Tegucigalpa, Honduras, Monday, Nov. 25, 2013. Hernandez, the ruling party candidate, held a comfortable lead in early vote counting to become Honduras' next president, while two of his four main opponents began crying foul early Monday over the results. (AP Photo/Eduardo Verdugo)

  • Manuel Zelaya

    Ousted President Manuel Zelaya, general secretary of the Free Party whose presidential candidate is his wife Xiomara Castro, greets supporters as he leaves a hotel after giving a press conference in Tegucigalpa, Honduras, Monday, Nov. 25, 2013. The two top presidential candidates continued to claim victory Monday in a hotly contested presidential race, as Hondurans awaited final results. (AP Photo/Moises Castillo)

  • A supporter of the Free Party presidential candidate Xiomara Castro shouts slogans during a protest against election results in Tegucigalpa, Honduras, Monday, Nov. 25, 2013. The two top presidential candidates continued to claim victory Monday in a hotly contested presidential race, as Hondurans awaited final results. (AP Photo/Eduardo Verdugo)

  • Supporters of Free Party presidential candidate Xiomara Castro shout slogans as her husband, ousted President Manuel Zelaya, gives a press conference in Tegucigalpa, Honduras, Monday, Nov. 25, 2013. The two top presidential candidates continued to claim victory Monday in a hotly contested presidential race, as Hondurans awaited final results. (AP Photo/Moises Castillo)

  • Juan Orlando Hernandez

    National Party presidential candidate Juan Orlando Hernandez speaks to supporters during his victory speech, after partial election results were announced in Tegucigalpa, Honduras, Sunday, Nov. 24, 2013. The electoral court said preliminary results gave Hernandez a comfortable edge over Xiomara Castro, whose husband Manuel Zelaya was overthrown in a 2009 military-backed coup. (AP Photo/Eduardo Verdugo)

  • Juan Orlando Hernandez

    National Party presidential candidate Juan Orlando Hernandez speaks to supporters during his victory speech, after partial election results in Tegucigalpa, Honduras, Sunday, Nov. 24, 2013. The electoral court said preliminary results gave Hernandez a comfortable edge over Xiomara Castro, whose husband Manuel Zelaya was overthrown in the military-backed coup. (AP Photo/Eduardo Verdugo)

  • Juan Orlando Hernandez, Ana Garcia

    National Party presidential candidate Juan Orlando Hernandez and his wife, Ana Garcia, left, waves to supporters during his victory speech, after partial election results in Tegucigalpa, Honduras, Sunday, Nov. 24, 2013. The electoral court said preliminary results gave Hernandez a comfortable edge over Xiomara Castro, whose husband Manuel Zelaya was overthrown in the military-backed coup.(AP Photo/Eduardo Verdugo)