Another person was shot and killed by federal immigration agents in Minneapolis. Here's what to know.

A man is dead after a shooting in Minneapolis on Saturday involving federal immigration agents from Customs and Border Protection, officials said.

Minneapolis Police Chief Brian O'Hara said at a news briefing that the man was 37-year-old American citizen who lived in Minneapolis.

Two Department of Homeland Security officials told CBS News that the man had a firearm and two magazines. 

O'Hara said police believe he was a lawful gun owner with a permit to carry. He did not identify the man but said his only previous interaction with law enforcement was traffic violations.  

DHS spokesperson Tricia McLaughlin said that officers were conducting a "targeted operation against an illegal alien wanted for violent assault" when "an individual approached U.S. Border Patrol officers with a 9 mm semi-automatic handgun." McLaughlin said the officers attempted to disarm the subject but the person "violently resisted." McLaughlin said an agent fired "defensive shots" because he feared "for his life and the lives and safety of fellow officers." 

First aid was rendered, but the man died, officials said. McLaughlin said he was pronounced dead at the scene, while O'Hara said he was pronounced dead at a hospital. 

McLaughlin said the person had no identification and said it looked "like a situation where an individual wanted to do maximum damage and massacre law enforcement."

Video footage verified by CBS News shows an altercation between several officers and a person on the ground before shots are heard. 

O'Hara said that Minneapolis police have not been provided with "any public safety statement around the incident, what happened," by federal agents. 

"We do not know what happened prior to the recording," O'Hara said. The police chief said the FBI and the Minnesota Bureau of Criminal Apprehension, the state's criminal investigative bureau, were on the scene.

The Minneapolis Police Department said the shooting took place near Nicollet Avenue and 26th Street. Police urged people to avoid the area. Video footage from CBS Minnesota station WCCO showed standoffs between protesters and federal officers. Airborne chemical irritants were being discharged, and whistling and shouting were audible on the video. Protesters were also seen setting up barricades of trash cans. One person told the station they wanted to keep ICE out of their community.

Law enforcement declared an unlawful assembly. McLaughlin referred to protesters as "rioters." 

During his remarks, O'Hara called for calm. 

Minneapolis Mayor Jacob Frey, who also spoke at the news conference with O'Hara, called for an end to the federal operation in Minnesota. 

"I just saw a video of more than six masked agents pummeling one of our constituents and shooting him to death," said Frey. "How many more residents, how many more Americans, need to die or get badly hurt for this operation to end? How many more lives need to be lost before this administration realizes that a political and partisan narrative is not as important as American values? How many times must local and national leaders must plead with you, Donald Trump, to end this operation and recognize that this is not creating safety in our city?"

Minnesota Gov. Tim Walz said earlier that he had spoken to the White House about the shooting. 

"Minnesota has had it. This is sickening. The President must end this operation," Walz said on social media. "Pull the thousands of violent, untrained officers out of Minnesota."  

This is the second time a person has been shot and killed by immigration officials in the city this month. Renee Good was shot and killed behind the wheel of her SUV earlier in January by Immigration and Customs Enforcement officer Jonathan Ross.