ARMED anti-lockdown protesters stormed Oregon Capitol today and declared it to be a patriot autonomous zone as they call for the governor's arrest.

Pistol-wielding Proud Boys, Patriot Prayer members and other far-right groups tried to storm the state building twice from 9am on Monday, where lawmakers were holding a closed special session on Covid-19 measures.

The clash escalated during the "Stop the Steal rally," reports said.

A female protester tried to gain entry through a window before she was stopped on the ledge by state troopers; minutes later, other demonstrators tried to push their way in through the north entrance at around 10am.

The Daily Beast reported that the group was repelled by the troopers who used some sort of deterrent that made a popping noise and caused protesters' eyes to water.

But that didn't stop 100 of them from entering the lobby on the west side of the building, egged on by three men with long guns, to decry Governor Kate Brown's coronavirus rules.

One protesters roared over a megsphone that "we are now declaring this area a patriot autonomous zone. If Antifa can do it so can we" as others tore down fences and tarps.