Caracas, Jan 6 (AFP) Opposition leader Juan Guaido and a rival lawmaker, Luis Parra, both claimed to be Venezuela's parliament speaker on Sunday following two separate votes and accusations of a "parliamentary coup."

Guaido was re-elected speaker by opposition lawmakers in a session held at a newspaper office after police blocked him from entering the National Assembly legislature.

In his absence, corruption-tainted Parra proclaimed himself speaker after claiming to have been elected with 81 votes in the 167-member chamber.

Guaido, who a year ago declared himself acting president in a direct challenge to the authority of socialist leader Nicolas Maduro, received the votes of around 100 lawmakers, including several forced last year into exile or to take shelter in foreign diplomatic missions due to a regime crackdown.

The 36-year-old Guaido vowed to "enforce" the constitution in his dual role as parliament speaker and "acting president."

But in a televised address, President Maduro gave his backing to Parra as the new speaker, adding that "Guaido was kicked out of the National Assembly by the votes of his own opposition."

Venezuela's opposition earlier denounced Parra's move as a "parliamentary coup." "Without votes, nor a quorum PSUV (socialist party) deputies are trying to swear in a false leadership," said the National Assembly, the only government branch in opposition hands, on its Twitter account.

Guaido and around a dozen lawmakers had been prevented from entering the assembly by police claiming to be carrying out a security operation, but deputies from Maduro's party and opposition ones that have rejected Guaido were allowed in.

Guaido, wearing a blue suit, attempted to climb over the railing around the National Assembly premises to gain entry to its compound, only to be pushed back by police with riot shields.

Images of Parra declaring himself head of the chamber by megaphone were shown on state television channel VTV.

After spending four hours outside parliament, Guaido and allied lawmakers went to the offices of El Nacional newspaper where they held their own session.

"This is unprecedented!" Guaido told a member of the security forces with whom he had a heated exchange. "What operation? Who ordered it?" "Those who help to prevent the legitimate installation of the Venezuelan parliament are converting themselves into accomplices of the dictatorship," Guaido wrote on Twitter.

Guaido has led the National Assembly for the last year and used that role to declare himself acting president on January 23, 2019 after parliament had branded Maduro a "usurper." (AFP)

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