Venezuela's embattled President Nicolas Maduro is delivering a televised address after Tuesday's protests led by opposition leader Juan Guaido, saying he will not surrender to US "imperialists."

Maduro said that the La Carlota military base in the capital of Caracas, where violent clashes took place earlier Tuesday, was not taken over.

More than 70 people who were injured in the clashes there between regime loyalists and protesters were taken to Salud Chacao Medical Center in Caracas, according to the hospital's president. Of the injured, 42 were wounded with rubber bullets and two were treated for gunshot wounds.