"In all there have been 28 deaths" since the protests first erupted in early February, Luisa Ortega Diaz said on the sidelines of the UN's Human Rights Council in Geneva.
"What began in Venezuela as a peaceful demonstration has been transformed into violence and chaos," she said, speaking a day after some 3,000 students marched in Caracas and similar numbers gathered in other cities to mark a month since the first deaths in weeks of demonstrations.
Speaking to a conference organised by the Venezuelan government on the country's "progress and achievements" in the area of human rights, Ortega Diaz said a prosecutor and three members of the national guard were among the dead.
One hundred and nine members of the national guard or Venezuelan national police force were also among the 365 injured, she said.
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She said police had seized 25 firearms, plastic explosives and more than 200 incendiary devices.
Since the protests began, opposition leaders and students, as well as government authorities, have accused each other of backing radical groups that attack demonstrations with firearms.
The anti-government protests first erupted on February 4 in the western city of San Cristobal, and reached Caracas on February 12 when three people were killed in clashes with security forces.
The demonstrations have been fuelled by public fury over deteriorating living conditions in the oil-rich South American country.
At today's conference, US Deputy Assistant State Secretary for Human Rights, Scott Busby, took the floor to criticise the Venezuelan government.