A week of protests against Venezuelan President Nicolas Maduro has left 35 people dead and 850 detained, non-governmental organizations said on Monday.
Another NGO, Foro Penal, said 850 people, among them 77 minors, have been arrested.
At the same time, Pope Francis said he was terrified the political crisis enveloping the country would descend into a "bloodbath".
Venezuelan President Nicolas Maduro and opposition leader Juan Guaido have been locked in a power struggle since Guaido proclaimed himself "acting president" Wednesday amid fierce protests over economic woes.
The standoff has split the international community between nations that recognize Guaido as president, including the United States and a dozen countries in the region, and those that still recognize Maduro, including Russia and China.