A sparse crowd of demonstrators gathered in Washington to rally for those criminally charged in the Jan. 6 deadly pro-Trump insurrection.

Organizers called the rally “Justice for J6,” referencing the date in which supporters of former President Donald Trump stormed the U.S. Capitol in an attempt to prevent the certification of the 2020 election results.

Protestors were met with heavy presence of local, state and federal law enforcement — and members of the press — outnumbering event attendees.

U.S. Capitol Police made a few arrests Saturday in an otherwise nonviolent demonstration, according to the department’s social media. Arrests included weapons violation, possession of a firearm and probation violation, according to police.

Washington Metropolitan Police Chief Robert Contee told NBC News the crowd was “about what we expected” and the heightened police presence may have deterred attendance.

Police in advance of Saturday ramped up security around the Capitol, erecting fences around the Capitol grounds, Supreme Court, the Library of Congress, and other congressional office buildings.

One hundred National Guard troops were on standby to help protect the Capitol, Defense Secretary Lloyd Austin said Friday.

Matt Braynard, the former Trump campaign staffer who organized the rally, previously told CNBC he expected the protest to be peaceful.

The Jan. 6 Capitol riot began shortly after Trump, speaking at a rally outside the White House, urged the crowd to march to Congress and fight against the certification of Joe Biden‘s election as president.

Four people died that day in connection with the riot, including a woman shot by a police officer as she tried to crawl through a window toward the House of Representatives chamber.

Capitol Police Officer Brian Sicknick died the following day after collapsing hours after he was attacked by rioters. Four police officers who responded to the insurrection have died by suicide since the attack.

Trump on Thursday said he sided with the rally attendees in condemning the criminal prosecution of the Jan. 6 riot participants.

More than 600 people have been arrested since the Jan. 6 attack, and over 50 of them have pleaded guilty to a variety of crimes. Six have been found guilty in court, according to the Justice Department.

—CNBC’s Kevin Breuninger, Dan Mangan and Amanda Macias contributed to this report.