According to local media says, Venezuela's opposition has called for a 24-hour strike on Thursday in protest against President Nicolás Maduro's plans for a new constituent assembly.
But, the leaders said 7.6 million people had taken part in Sunday's opposition-organised referendum on the plans.
They also announced they would name new Supreme Court judges.
The assembly, made up of citizens, would have power to scrap the National Assembly and rewrite the constitution.
Opposition parties control the National Assembly and are calling for fresh elections before Mr Maduro's term expires in early 2019.
"It is time for zero hour," said opposition leader Freddy Guevara, speaking on behalf of the Democratic Unity coalition.
"We call on the whole country this Thursday to join massively and peacefully a national civic strike of 24 hours as a mechanism of pressure and preparation for the definitive escalation which will be next week."