by Enrique Krause and Biodun Iginla, BBC News, Caracas
More than seven million voters have taken part in an opposition-organised referendum in Venezuela, according to academics monitoring the poll.
Voters strongly opposed government plans for a new constituent assembly with the power to scrap the National Assembly and rewrite the constitution.
Venezuela is polarised between backers of President Nicolás Maduro and opponents, who want fresh elections.
A nurse was shot dead while queuing to vote in the capital, Caracas.
Men on motorbikes opened fire, killing 61-year-old Xiomara Soledad Scott, and wounding three others.
The opposition blamed a “paramilitary” gang for the shooting, which prosecutors said they would investigate.
Separately, journalist Luis Olavarrieta was grabbed by what he said were a group of government supporters who robbed and beat him, but he managed to escape.