Presenting the preliminary findings from an investigation conducted in June and July, the United Nations rights office described "a picture of widespread and systematic use of excessive force and arbitrary detentions against demonstrators in Venezuela".
Late Monday, the head of the pro-Maduro assembly, former foreign minister Delcy Rodriguez, led soldiers and others in invading the chamber where the opposition-controlled National Assembly meets, sharpening tensions between the rival bodies.
Four months of street violence have left almost 130 dead.
The document is a response to the "superpower" made up exclusively of Chavistas and has taken control of the Venezuelan government, initiating a series of political persecutions that have resulted in the arrest of several opposition mayors, as well as the dismissal of the Attorney General of the Republic, Luisa Ortega Díaz.
Venezuelans voted on July 30 and elected a 545-member constituent assembly that gave Maduro new powers by dissolving state institutions.
Mr. Guterres' spokesman said United Nations is closely following events in the country and is convinced the crisis requires a political solution based on dialogue and compromise.
Nevertheless, Peruvian Ambassador, Ricardo Luna, said on the side that the group is open to supporting a "believable and bona fide" dialogue with President Nicolas Maduro's government.
The Venezuelan government is making it harder for opposition groups to take to the streets.
Crispr first as disease-causing mutation edited in human embryos
Paula Amato , stated that the gene-editing technique has the potential to make it easier for people to conceive healthy babies. That can already be done using pre-implantations, genetic diagnosis, prenatal testing or termination of pregnancy, he says.
The U.S. State Department is repeating its rejection of the new government-loaded assembly rewriting Venezuela's constitution, saying it's "an illegitimate product of a flawed process designed by a dictator".
Peru was urging that Maduro's government be condemned for carrying out "a new form of coup d'etat" through the "unconstitutional" Constituent Assembly, that political prisoners in Venezuela be freed, and that the country hold scheduled elections, diplomatic sources said.
Peru's president has been a vocal critic of the Maduro regime, but the region has had trouble agreeing on collective actions.
The main leader of the British Labor Party, Jeremy Corbyn, a longtime supporter of Chavismo in Venezuela, has issued a statement condemning Venezuelan demonstrators and lamenting the alleged martyred "security forces who have been killed by people on the streets".
Foreign ministers from 17 Western Hemisphere nations, however, refused to recognise the new "all-powerful body", AP reported.
Separately, only a few dozen demonstrators heeded the opposition's call to set up traffic-snarling roadblocks Tuesday in Caracas to show their opposition to the new assembly.
The European Union is criticizing the removal of Venezuela's public prosecutor by a newly installed constitutional assembly with almost unlimited authority to govern.
Meanwhile, leaders from the Bolivarian Alliance, a leftist coalition of 11 Latin American nations, met in Caracas and declared Venezuela's constitutional assembly a "sovereign act" aimed at helping the nation overcome its difficulties.