This is all we know about the September 18 demonstration of the right in Washington.

(CNN) – The right-wing demonstration on September 18 in Washington is sparking a new wave of concern, over the possibility of further acts of violence on Capitol Hill, as law enforcement officers prepare for various scenarios.

But it is not yet clear how many protesters plan to attend. In addition, the demonstration takes place this Saturday, when both houses of Congress are in recess, which means that there will be far fewer legislators or staff in the area.

Here’s what you need to know:

What is the demonstration for?

The demonstration “Justice for the J6” aims to support the insurgents accused in the mortal January 6 riot on Capitol Hill. Organizers say it is scheduled to begin at noon Eastern time this Saturday.

Who are the organizers?

The rally is being planned by “Look Ahead America,” a nonprofit run by former Trump campaign employee Matt Braynard. The group is “dedicated to defending patriotic Americans who have been forgotten by our government.” according to your website.

Braynard said in a recent interview with CNN that “this is a completely peaceful protest” and that “we have told people that when they come we do not want to see any messages about the elections, we do not want to see any messages on T-shirts and flags or posters about the candidates or anything like that. “

Even so, at least one leader of the Proud Boys he has encouraged his supporters across the country to come, although others on the internet have discouraged attendance and warned that it could be a false flag operation designed to trap supporters.

Meanwhile, “White Lives Matter” is announcing global rallies for September 18 and has supported the January 6 insurgents online, but does not have a section for the city of Washington.

What do the authorities expect?

Law enforcement agencies are preparing for possible clashes and riots during the rally, according to an internal Capitol Police memo reviewed by CNN.

The latest intelligence report on the event notes that online conversations in support of the rally began to escalate after the officer who fatally shot rioters Ashli ​​Babbitt made his identity public in a recent interview with NBC’s Lester Holt.

According to the memo, there was a notable increase in violent rhetoric surrounding the event and heated discussions centered on the Babbitt shootings on social media and on discussion boards.

The document warns that many people may also view September 18 as a “Justice for Ashli ​​Babbitt” rally, which could be cause for concern, and it is not unreasonable to anticipate violent altercations.

There is also talk of the violence associated with the event, and an online chat suggests violence against Jewish centers and liberal churches while law enforcement is distracted that day.

About 500 people have indicated that they plan to attend, although the note notes that the latest Look Ahead America events had significantly lower than expected attendance and were peaceful.

What security measures will be taken?

The United States Capitol Police Board approved the request from the Department of reinstall a temporary fence around the Capitol before the rally.

The fence was installed around the Capitol after the January 6 riots, but was lowered and removed over the summer.

Additionally, Capitol Police said in a statement Monday that its board of directors had “issued an emergency declaration, which will take effect around the time of the rally and will allow the Department to delegate outside law enforcement officers as special agents of the United States Capitol Police. “

“We want to assure everyone that these are temporary measures to ensure everyone’s safety,” said the Capitol Police Chief Tom Manger, in the statement. “We are very grateful for the support we continue to receive from the local community and our interlocutors in Congress as we carry out our critical mission.”

What are legislators saying about security preparations?

After Manger briefed the top four congressional leaders on the security preparations for the rally, House Speaker Nancy Pelosi told reporters that the planning “seems much better.”

But Pelosi also noted that she has “nothing to compare with, because we were not informed before,” referring to the January 6 insurrection. “So I can’t compare it to before, but … I’m sure we will have ongoing communication,” she added after leaving the briefing.

Senate Majority Leader Chuck Schumer also said he believes the Capitol Police are “well prepared, thorough and professional, and I think they are better prepared than people before January 6.”

CNN’s Melanie Zanona, Jessica Schneider and Whitney Wild contributed to this report.