The security chief of Venezuelan opposition leader Maria Corina Machado was arrested early Wednesday, her Vente Venezuela political movement said.
The arrest came less than two weeks before the July 28 vote, where the opposition coalition's candidate, Edmundo Gonzalez, is polling significantly ahead of President Nicolas Maduro, who is seeking a third term.
Machado, who resoundingly won the opposition's October primary, was barred by a court from running in the election over alleged fraud, which she denies. Several dozen of Machado's allies have also been detained.
The Vente Venezuela movement said officials took Machado's security chief, Milciades Avila, from the house where he had been staying.
"I'm warning the world about Maduro's escalation of repression against those who work in the campaign or help us in any part of the country," Machado said on X.
Venezuela's opposition has repeatedly denounced arrests and other moves by the authorities that they say are meant to harm its election campaign and prevent a fair election.
A spokesperson for the U.S. State Department said Washington was concerned by Avila's arrest.
"Arrests without due process run contrary to the spirit of the October 2023 electoral road map agreement," the spokesperson said, calling for Avila's immediate release.
Avila was "accused of gender violence" against a group of women who had "tried to attack Edmundo and me" at a food store in La Encrucijada, located in the country's Aragua state, last Saturday, Machado said.
Pictures in local media showed a group of women, including some officials from a regional governor's office and known supporters of the ruling party, confronting Machado and Gonzalez.
Machado said on X that Avila's detention was aimed at leaving her team unprotected for the remaining period of the election campaign.
Avila has worked with Machado for a decade and "risked his life to defend me," she said.
Machado said she held Maduro responsible for Avila's safety and that of 24 other team members who have been detained.
Foro Penal, a nongovernmental organization, said Monday that 102 people have been detained since the start of the election campaign on July 4.
The Venezuelan communications ministry and attorney general's office did not immediately respond to requests for comment.
The United States and others have dismissed the 2018 reelection of Maduro as a sham. Washington has urged Maduro's government to ensure the election is "competitive and inclusive."
Six of Machado's former campaign staff are currently seeking political asylum at the embassy of Argentina.
