A fresh UN report warned that the rights situation in Venezuela was at "grave risk" of unravelling further as the authorities continue to systematically and brutally repress demonstrators, and urged international action.
The extent of the violations "points to the existence of a policy to repress political dissent and instil fear in the population to curb demonstrations at the cost of Venezuelans' rights and freedoms," the report from the UN human rights office said.
Venezuela, which is suffering from an acute economic crisis marked by shortages of basic goods, has experienced months of street demonstrations against President Nicolas Maduro that have left 125 people dead, according to prosecutors.
Today's report found that security forces and pro- government groups were responsible for at least 73 of the protester deaths.
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It remained unclear who was behind the remaining deaths, the rights office said.
The tactics listed in the report included "the use of electric shocks, severe beatings, stress positions, suffocation, and threats of sexual violence and death."
After receiving no response to repeated requests for access to Venezuela to investigate the situation in the country, Zeid deployed a team of human rights officers to monitor the country remotely.
The investigators conducted 135 interviews between June 6 and July 31 with victims and their families, witnesses, civil society organisations, journalists, lawyers and doctors, among others.
"The right to peaceful assembly was systematically violated, with protestors and people identified as political opponents detained in great numbers," Zeid said in a statement today.
More than 5,000 people have been detained in Venezuela since April 1, with more than 1,000 still held by the end of July, the report found.
It also pointed to repeated attacks on journalists and media workers that "appeared to be intended to prevent them from covering protests."