Armoured military trucks have been filmed ploughing into protesters outside a military base in Caracas.
It comes as the country has descended into anarchy as people took to the streets to protest the Nicolas Maduro regime.
Black smoke was also seen rising behind a military hangar on La Carlota.
Other scenes include soldiers dispersing a crowd by firing shots in Naiguata, Vargas.
The Venezuelan government has also told Radio Caracas to stop broadcasting since the chaos broke out.
Opposition leader Juan Guaidó, who announced himself interim president in January, announced he was in the “final phase” of ending President Nicolás Maduro’s rule.
He has been urging people to remain on the streets and called for more members of the military to help fight against Maduro’s “usurpation” of power.
“Brave people of Venezuela, your time has come!”
Mario Abdo Benítez
Guaidó says President Maduro is a “usurper” because he was re-elected in polls that had been widely disputed.
Maduro won a narrow election in 2014 after the death of long-serving socialist leader Hugo Chavez – the vote is marred in claims of fraud.
But the socialist Maduro regime has accused Guaidó of orchestrating a coup.
Venezuela has been ravaged by years of hyperinflation, power cuts, food and medicine shortages.
But the people have stood by Mr Maduro – despite dozens of countries, including the US and most of Latin America, recognising Mr Guaidó as the country’s true leader.
The President of Paraguay, Mario Abdo Benítez, also waded in today, saying: “Brave people of Venezuela, your time has come!”
Assistant to the President for National Security Affairs, John Bolton, tweeted: “The end of Maduro’s usurpation of power is possible.
“Venezuela’s armed forces should stand loyal to their people and the constitution. Democracy will be restored in Venezuela.”