Amnesty International has released a report which documents  “allegations of human rights violations and abuses committed in the context of the massive public demonstrations since early February.”
“The country runs the risk of descending into a spiral of violence unless steps are taken to bring the conflicting parties around the table. This can only happen if both sides fully respect human rights and the rule of law. Unless this happens, the death toll will continue to rise with ordinary people bearing the brunt,” said Erika Guevara Rosas, Americas Director at Amnesty International.
According to the report, 37 people have died and over 550 have been injured:
According to figures released by the Office of the Attorney General on 27 March 2,157 have been detained during the protests. The vast majority has been released but continue to face charges.
You can read the complete report  [es] in the Spanish-language version of the Amnesty International website.