The OAS head has said Venezuela should be suspended from the body if it does not hold general elections.
The indigenous fear that some parliamentarians could work in favor of large landowners.
Inmates at this low-security prison are serving time for crimes such as theft, drug trafficking and extortion.
Dozens of people gathered in downtown Los Angeles on Tuesday to express support to 54-year-old Teresa Vidal-Jaime.
The number of deaths since protests started a month ago rose to 26 on Tuesday.
The Interior Department said in a statement the truck was stolen Sunday in Tlaquepaque, a town in Jalisco state.
Maduro said he wouldn't give in to opponents and again urged them rejoin negotiations.
One police officer was killed and two guards were wounded. Some civilians also sustained minor injuries.
Venezuela's opposition renewed nationwide protests on Thursday to pressure President Nicolas Maduro to hold election.
Amelia Bannan was nearly six months pregnant when she suffered a skull fracture that resulted in a blood clot in her brain.