Updated at 6 p.m. Sunday: Revised to include additional details about videos posted Saturday and Sunday.

After reports spread that white supremacists planned to demonstrate in North Texas over the weekend, one group said it had staged demonstrations in and near downtown Dallas.

The group, the American Identity Movement, also posted videos online showing fewer than a dozen protesters chanting outside the Meyerson Symphony Center and unfurling a banner on the Ronald Kirk Pedestrian Bridge near Trinity Groves.

It's unclear when the videos were made. The banner was no longer on the bridge Sunday afternoon.

Dallas police Sgt. Warren Mitchell said he wasn't aware Sunday of any police response to either incident.

Dallas police had increased patrols downtown after unconfirmed reports on social media that white supremacists planned to march Saturday.

As a precaution, several squad cars were stationed Saturday around Pioneer Plaza and the adjacent Confederate War Memorial.

"The public is encouraged to be vigilant while enjoying the activities this great city has to offer," police said in a written statement.

As the afternoon turned to evening, however, no rally materialized and the heavy police presence had mostly dispersed.

Days earlier, a Dallas police spokesman said officers would not interfere in any rally, so long as it remained peaceful.

The Dallas Police Department is aware of a social media post warning the public of possible violence in the downtown area. All social media postings are being monitored by the Fusion Center. The veracity of these posts has not been confirmed. See blog https://t.co/TawTaGJCF4 — Dallas Police Dept (@DallasPD) August 17, 2019

The warning from police came days after Democratic Party leaders in Dallas and Collin counties condemned the possibility that a hate group may be planning to have a conference in North Texas over the weekend, officials said.

Party spokespeople in the counties said they'd heard reports that AIM, formerly known as Identity Evropa, was planning the conference and a day of action for Saturday and Sunday in Dallas and McKinney.

The group was one of the organizers of the August 2017 Charlottesville, Va., rally in which a woman was killed.

"The white supremacy movement must be stopped in America," Dallas County Democratic Party chairwoman Carol Donovan said. "It is contrary to the founding principles of our republic."

Collin County Democratic Party spokesman John Shanks said officials learned about the possibility of the event after a recent hack revealed planning documents from AIM that indicated the group planned to meet in Dallas and stay in McKinney hotels or Airbnb rentals. He urged residents not to engage AIM members.

"White nationalist ideology does not belong in our county today and threatens what truly makes our country great," Collin County Democratic Party Chairman Michael Rawlins said. "Collin County is a diverse and welcoming home for more than a million people."

Staff writers David Tarrant, LaVendrick Smith, Maria Elena Vizcaino and Dana Branham contributed to this report.