Activist Dominique Alexander and other individuals were transported to Dallas Police Headquarters for questioning regarding an incident at a protest, a police spokesperson said.
Attorney Kim Cole said Alexander was issued two misdemeanor citations of assault, and arrested for at least 10 outstanding warrants. He's currently being held at the Central Detention Center.
Today's incident occurred around 11:30 a.m. at a #WalkAway Rescue America Rally at Main Street Garden Park. The WalkAway Campaign holds events throughout the country, according to its website. It is a grassroots group that encourages people to walk away from the Democratic party.
Videos posted to social media Saturday afternoon show an encounter between Alexander and other protesters. Part of the encounter shows an unidentified man push Alexander to the ground and another unidentified man spray a person with a substance protesters believe was mace.
Alexander is the president and founder of the Next Generation Action Network. Their mission is to lobby for social change and equality for all regardless of race, religion, nationality, gender, sex, or age, according to the organization's website.
Video posted to the NGAN's Facebook page shows Alexander being handcuffed. During a Saturday afternoon news conference, the organization said he was arrested after being assaulted at the rally.
Police officials have not confirmed to WFAA how many people were taken in for questioning.
Demonstrators gathered outside of police headquarters and told WFAA that they weren't going to leave until Alexander was released from questioning.
As the gathering outside the police headquarters grew, WFAA reporter Eric Alvarez spoke with Brandon Straka of the WalkAway Campaign. He said the man seen in the video taking Alexander to the ground was a hired security guard. He said that man was also brought in for questioning and has not been released.
After learning of Alexander's arrest, Black Lives Matter supporters began their march to the Dallas County jail, and then headed to the Central Detention Center.
NGAN said their founder, Alexander was the victim. They said they will continue protesting until he is released.
Download our free WFAA app to stay up-to-date on all news stories in the Dallas-Fort Worth area.
Digital producers Jozelyn Escobedo and Briauna Brown contributed to this story.