Venezuelan opposition leader Juan Guaidó has called for an escalating series of strikes to force President Nicolás Maduro to relinquish power, the BBC reports.
Mr Guaidó urged public employees to act on Thursday, saying the stoppages would lead to a general strike.
A woman was killed in clashes between protesters and security forces in Caracas on Wednesday, reports say.
Mr Maduro meanwhile dismissed suggestions he had been ready to flee and accused the US of directing a coup. Those involved would be punished, he said.
US Secretary of State Mike Pompeo said the US could take military action to resolve the crisis and accused Russia and Cuba of destabilising the country through their support for Mr Maduro.
Russian Foreign Minister Sergei Lavrov told Mr Pompeo that America’s influence over Venezuela was destructive and a violation of international law.