The Hong Kong government said in a Monday statement that the new Elections Committee is "broadly representative" and made up of "a number of subsectors."
The group was trying to target public areas in the city "to maximize damage caused to the society," Hong Kong police said.
"We must not let their methods become the new normal," RSF secretary-general Christophe Deloire said in the report.
Opponents say the new national security law is a tool to quash pro-democracy dissent in the Chinese territory, but supporters have said it ensures that officials in charge of the city are Chinese loyalists focused on public order and economic development.
Hong Kong leader Carrie Lam, who is due in Beijing on Tuesday, also praised China's national security law at a media address the day before.
Hong Kong's Chief Executive Carrie Lam announced the September elections would be postponed a year citing the coronavirus outbreak.
Chinese state media have compared the police response to U.S. unrest with how Hong Kong demonstrations were dealt with last year.
Carrie Lam has warned that countries could hurt their own economic interests if they apply sanctions to the city.
Pro-democracy candidates swept the board in local council elections this weekend, winning almost 90 percent of seats.
If the Hong Kong government was really confident in the path and actions it has recently taken, there would be no hesitation whatsoever in holding a free and fair election this weekend.
The November elections are for local councils but are set to become a proxy vote on the government's handling of the months-long protests and Beijing's encroaching influence in the territory.
At least 750 children have been arrested by Hong Kong police since mass anti-government protests broke out in June.
Hong Kong Chief Executive Carrie Lam pulled out of the meeting when she discovered that Ted Cruz had told reporters about the plans.
The Hong Kong chief executive bowed to months of pressure and withdrew the controversial bill on Wednesday.
A Chinese official blamed the protesters for undermining Hong Kong's stability and prosperity through weeks of continuous demonstrations.
Trump has been reticent to criticize Beijing despite strong condemnations from the State Department and lawmakers from both parties.
"The way forward is genuine democratic elections, not violence in the streets," Taiwanese Foreign Minister Joseph Wu said.
At least 45 people were injured, one critically, after dozens of alleged triad gang members stormed a subway station and began attacking commuters.
In the run-up to Carrie Lam's victory, student leaders eschewed public protests and opted instead to use social media, leaflets and street booths to present their case that the election was undemocratic.
Public opinion polls show Carrie Lam's rival, John Tsang, as more popular with residents.
"It's not easy to be an activist facing the largest authoritarian regime in the world," says Demosisto campaigner Derek Lam.