At least 23 arrested as crowds turn unruly following pro-Trump rally in DC
Later in the evening, the scene became unruly. WRC-TV reported that four people were taken to a hospital with stab wounds, and the Metropolitan Police Department told the station that 23 people were arrested.
Videos posted to social media showed confrontations between Trump supporters and opponents and people wearing pro-Trump attire attacking bystanders. In one incident, a bystander pulled out a knife after arguing with Trump supporters. In another, police pepper-sprayed people involved in a scuffle.
http://www.jsonline.com/story/news/nation/2020/12/12/trump-march-brings-thousands-dc-ahead-electoral-college-vote/3882935001/
...in case you guys missed the subtle nuances here, the folks wearing trump attire were "attackers". The guy with the knife who may have some vital information for the cops about the four by stabbings was a "bystander". Just wanted to clear that up for ya.