Washington DC – The leader of the far-right group the Proud Boys, Henry "Enrique" Tarrio, on Monday was sentenced to 155 days of incarceration by a Washington court.

Tarrio had pleaded guilty to one count of destruction of property and one count of attempted possession of a "large-capacity ammunition feeding device," the US Department of Justice (DoJ) said in a statement.

"The remainder of the sentence – another 85 days – will be suspended for a three-year probationary period," the DoJ said, adding that the 37-year-old also had to pay a $1,000 fine and $347 in compensation to a church whose property was damaged.

In December, on the sidelines of protests against the presidential election defeat of then-president Donald Trump in Washington, Tarrio took part in the burning of a Black Lives Matter flag that had been stolen from a historic black church in the US capital by members of his group.

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The head of the Proud Boys, who lives in Florida, candidly admitted the act on social media and in comments to media outlets.

He was arrested two days before a violent mob of Trump supporters attacked the Capitol building in Washington on January 6. At the time of the arrest, police found "two high-capacity firearm magazines," the DoJ said.

Tarrio was ordered by a judge to stay outside of Washington until his next court hearing.

The mob stormed the Capitol in an effort to prevent the US Congress from officially confirming Joe Biden's election victory over Trump.

US federal officials have said the Proud Boys, considered to be a hate group by the Southern Poverty Law Center, were among the primary instigators of the attack.