With closed streets and shuttered businesses keeping many residents away from downtown D.C., Trump supporters have begun gathering for a slate of rallies to protest Congress certifying Joe Biden’s victory in the 2020 election.

The Metropolitan Police Department announced six arrests related to the demonstrations as of 10 p.m. on Tuesday, with a series of gun-related charges, assault, assault on a police officer, possession of a taser, possession of illegal fireworks, and a traffic offense.

The arrests come as far-right groups have threatened to violate the District’s strict gun laws and otherwise wreak havoc in the city. Acting D.C. Police Chief Robert Contee pledged this week that law enforcement would not tolerate firearms at the demonstrations. There’s signage throughout the downtown area explaining that all firearms are prohibited within 1,000 feet of the signs.

Police are focusing on trying to keep demonstrators separate from any counterprotesters. D.C. officials have been warning residents to stay away from areas where rallies are expected, including Freedom Plaza, the U.S. Capitol, and the Supreme Court. Mayor Muriel Bowser urged Washingtonians not to “engage with demonstrators who come to our city seeking confrontation.”

But large crowds are expected at tomorrow’s events. One permit has been updated with a maximum attendance of 30,000 people.

“There is a general consensus that there will be significant turnout,” Ward 6 Councilmember Charles Allen told DCist, citing hotel occupancy rates and President Donald Trump’s promotion of the events.

For weeks, Trump has been encouraging attendance at these demonstrations, along with spreading false claims about the election outcome. He plans to speak at the rally at the Ellipse on Wednesday.

In addition to MPD, U.S. Park Police, and Secret Service policing the events, the D.C. National Guard has been called up to help with crowd and traffic control.

Among the expected crowds at this week’s events in D.C. are the Proud Boys, an extremist group with ties to white supremacy. At previous MAGA rallies in D.C. in November and December, the Proud Boys were linked to violent incidents and property damage, including the burning of Black Lives Matter signage taken from historic Black churches.

Proud Boys Chairman Enrique Tarrico claimed responsibility for burning one of the banners. D.C. police arrested Tarrico on Monday as he arrived in the city over the incident and discovered he was in possession of two high-capacity firearm magazines, according to law enforcement. At his first court hearing on Tuesday, a judge released him from custody and barred him from the District. He could face arrest if he sticks around for the rallies.

Meanwhile, the group has pledged to eschew its signature black and gold colors to go “incognito” in D.C.’s streets. Over the course of two previous rallies in the city since the election, at least five people were stabbed and police made more than 50 arrests.

This story has been updated with additional information. Reporting contributed by Rachel Sadon.