Opposition leader María Corina Machado was briefly detained in Caracas after a protest rally, sparking widespread condemnation.
The arrest, followed by a quick release, is seen as a tactic to suppress dissent against President Maduro's controversial inauguration.
International observers and opposition groups denounce the election results as fraudulent and lack credible evidence of Maduro's victory.
Machado's detention highlights the escalating political tensions and human rights concerns within Venezuela.
