Amnesty International said Tuesday it believes the Venezuelan authorities have committed crimes against humanity in their crackdown on anti-government protests, and urged the International Criminal Court to investigate.
The rights group said President Nicolas Maduro's government responded with "a systematic and widespread policy of repression" in late January, when anti-government protests swept the country after opposition leader Juan Guaido declared himself acting president.
Maduro opponents were tortured and killed during the protests, it said.
"The nature of the attacks... the level of coordination by the security forces, as well as the signs of similar patterns in 2014 and 2017, leads Amnesty International to believe that the Venezuelan authorities committed crimes against humanity," Amnesty said in a statement.
Maduro, the political heir to late leftist firebrand Hugo Chavez, has presided over a spiralling political and economic crisis in Venezuela since taking office in 2013.
He was re-elected to a second term in May 2018, in a vote boycotted by the opposition and rejected by much of the international community.
Guaido, the leader of Venezuela's opposition-controlled legislature, declared himself acting president on January 23. He has since been recognized by more than 50 countries, led by the United States.
Amnesty sent a fact-finding mission to the country in February to research the ensuing crackdown.
The London-based rights group said at least 47 people were killed during the protests from January 21 to 25. At least 33 were shot dead by the security forces, and six by government supporters.
Eleven of the deaths were extrajudicial executions, it said.
"State forces identified people who had been prominent in the protests in their communities, located them and shortly afterwards killed them.... Some of them were tortured before they were killed," it said in its report.
More than 900 people, including children, were arbitrarily detained over the same period, it said, calling on the UN Human Rights Council and International Criminal Court to investigate.
Its team found that crimes and human rights violations were committed in "an attack planned and led by the security forces against individuals identified as or perceived to be opponents, particularly in impoverished areas."
Maduro himself "knew about these public and appalling acts and took no measures to either prevent or investigate them," it said.