Venezuela's opposition leader Juan Guaido says he will continue trying to convene parliament after armed groups on motorcycles prevented members from entering the building.
The violent confrontation marked the second time this month that deputies have been barred from the chamber.
It houses the only branch of government that remains beyond the control of President Nicolas Maduro.
Maduro has been trying to isolate Guaido a year after he declared himself interim president.
Al Jazeera's Lucia Newman reports from Caracas.