The three people who were injured had non-life-threatening injuries, the Minneapolis Police Department said.
The US Marshalls said the man was parked in a car and would not comply. Officials said he produced a handgun.
The City of Minneapolis said it is working with community organizers to preserve memorials and artwork found at George Floyd Square.
A spokesman didn't want to speculate about why the active-duty force shrank after Floyd's death, but pointed to efforts to bring on more recruits.
One person was treated at the hospital for a gunshot injury that didn't appear to be life-threatening, Minneapolis Police told Insider.
George Floyd Square is a barricaded area governed by its residents to memorialize the loss of life. But it might not last much longer.
The victims include five men and five women, police said. Eight injured victims were sent to local hospitals. One is in critical condition.
A video shows the child wandering into a moving baggage system at Minneapolis-St. Paul International Airport on Saturday. Police found him uninjured.
After Derek Chauvin's guilty verdict for the murder of George Floyd, lasting change in police accountability is unlikely to come from the courtroom.
The former police officer said he felt the jury "was under tremendous pressure to 'make it right' for George Floyd."
Derek Chauvin was convicted. But Minnesota's been a hub of police violence. Victims' families channel their grief to call for reform.
Crowds outside the Minneapolis courthouse reacted with tears and celebrations after Derek Chauvin was found guilty in the death of George Floyd.
Chauvin, a former police officer, is accused of killing George Floyd. Floyd's death sparked protests during which some stores were damaged.
Students from across the state walked out of class on Monday in coordinated protests.
In anticipation of the results of the Derek Chauvin trial, Facebook is making a major moderation change aimed at protecting George Floyd's memory.
Former Minneapolis police officer Derek Chauvin is on trial for the death of George Floyd, and jury deliberations are due to start next week.
Daunte Wright, who was fatally shot by police on April 11, was deeply affected by the death of George Floyd almost a year ago, his family said.