According to the High Commissioner of united Nations for Human rights, Zeid Ra'ad al Hussein, "many thousands of people have been placed in arbitrary detention, many would have been victims of ill-treatment and even torture".
Venezuela's new constitutional assembly has passed a decree declaring itself superior to all other branches of government.
Venezuelan Foreign Minister Jorge Arreaza told representatives from nations including Cuba and Bolivia that long-standing US aggressions against the South American nation have "entered a much stronger phase".
Chacao was previously governed by Leopoldo Lopez, the most prominent activist to have been jailed by the Maduro government, and is the main gathering point for protests that have left at least 124 dead and hundreds more injured or arrested.
The opposition to Maduro also faced another fight on Wednesday before the Supreme Court, which scheduled a hearing on charges against a Caracas-area opposition mayor.
The constituents also approved Tuesday during their second session a decree of coexistence with the state's public powers, reiterating that they will not replace the National Assembly that is now led by the opposition.More news: Terror probe after blade incident at Eiffel Tower
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.
To work around the Parliament, where the opposition is in the majority since the beginning of 2016, it installed Saturday for a constituent Assembly, can dissolve the Parliament and rewrite the Constitution of the deceased Hugo Chavez, president from 1999 to 2013.
The Venezuelan government is making it harder for opposition groups to take to the streets.
The new constitutional assembly has signaled it will act swiftly in following through with Maduro's commands.
Chile's foreign minister Heraldo Munoz told reporters that the group does not intend to meddle in Venezuela's sovereign affairs.
The cyber bullies hacked dozens of official websites managed by the Venezuelan government as an attempt to destabilize the Caracas regime.More news: Changes to the National Security Council
Peru called the government of Venezuela a "dictatorship" on Tuesday after hosting the first meeting of a new, 17-member regional bloc that aims to seek a peaceful end to the country's political crisis.
"It is unclear who the perpetrators in the remaining deaths may be", it said.
Foreign ministers from 14 countries are meeting in Peru to discuss the growing political crisis.
The new assembly was created in a July 30 national vote orchestrated by Maduro and boycotted by the opposition.
A further five nations participated in the meeting but didn't sign the document.
Despite a widespread popular uprising, that has been violently repressed by state security forces, causing more than 120 deaths, Corbyn appears to place ideological affinity with his socialist comrade Maduro over human rights considerations, even though virtually the entire global community has aligned to reject Maduro's power grab.More news: President Trump not 'very happy' with Russia sanctions bill, says Tillerson