"How many more residents, how many more Americans need to die or get badly hurt for this operation to end?" Minneapolis Mayor Jacob Frey said at a news conference hours after the shooting. "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?"

Tensions are roiling the Twin Cities weeks after a U.S. Immigration and Customs Enforcement agent fatally shot Renee Good, a 37-year-old U.S. citizen. Her Jan. 7 shooting death touched off widespread protests in the city as immigration agents continued to fan out into neighborhoods to make their arrests. Saturday's shooting occurred in downtown Minneapolis, less than two miles from where Good was shot.

In its initial statement on the shooting, the Department of Homeland Security said an agent, acting in self-defense, fired his weapon after an "armed struggle" with a man who "approached US Border Patrol officers with a 9 mm semi-automatic handgun." The officers tried to disarm the man, but he "violently resisted," the statement added. As with Good's death, eyewitnesses and video evidence contradicted the Trump administration's narrative. According to bystander accounts and videos, Pretti was documenting the scene with a phone before agents tussled with him. He wasn't seen reaching for his licensed handgun.

Body camera footage of Pretti's killing from multiple angles is now being reviewed by investigators, DHS confirmed to PBS News. The agency did not answer questions about whether that footage — or possible video recorded by Pretti's cell phone — would be publicly released.

Federal officials have so far shut local and state investigators out of the investigation, despite a court order instructing agencies not to destroy evidence and bipartisan congressional calls for a full, joint investigation.

By Monday, Trump posted on social media that he had a "very good call" with Democratic Gov. Tim Walz and the two "seemed to be on a similar wavelength" in regards to immigration in Minnesota.

As fuller details of the shooting come into view, here's what we know so far.

How did the shooting occur?

Minneapolis Police Chief Brian O'Hara said officers responded to a report received around 9:03 a.m. local time Saturday of a shooting involving federal law enforcement near E. 26th Street and Nicollet Avenue. The city's officers found a 37-year-old white male with multiple gunshot wounds.

The man, later identified as Alex Jeffrey Pretti, was believed to be a "lawful gun owner" with a firearm permit, O'Hara said. He added that Pretti's only known interactions with law enforcement had been for traffic tickets.

Videos taken by other civilians show the events leading up to Pretti's deadly encounter with federal agents. He's first seen filming the scene in the street. Whistles blare from nearby protesters. An agent shoves a demonstrator with a red backpack to the ground and is seen spraying a chemical agent in people's faces. Pretti, who uses one hand to protect himself from the spray and holds his phone in the other, moves to help a woman who was also affected.

More agents approach and pull Pretti back. There's a scuffle as Pretti appears to resist agents who pin him down and hit him repeatedly. At one point, at least one agent is heard saying Pretti has a gun. Soon after, an officer appears to remove a gun from a holster on Pretti. One agent fires a single shot before several more ring out.

Who was Alex Pretti?

Susan and Michael Pretti, Alex's parents, first learned of their son's death from an Associated Press reporter.

The couple, who live in Colorado, released a statement Saturday, saying their son was a "kindhearted soul who cared deeply for his family and friends." The 37-year-old Minneapolis resident had worked as an ICU nurse at a VA hospital in the city.

"Alex wanted to make a difference in this world. Unfortunately he will not be with us to see his impact," the statement read.

Pretti was born in Illinois and grew up in Green Bay, Wisconsin, where he was Boy Scout, played high school football and baseball, and sang in a boys choir. He was also an outdoorsman who took his dog Joule, who recently died, everywhere he went, his mother told AP.

The American Nurses Association released a statement Saturday, offering condolences. The group called for a "full, unencumbered investigation" and that the findings be promptly shared with the public and Pretti's loved ones.

What the Trump administration is saying

Days after Alex Pretti's killing, President Donald Trump said he did not think the 37-year-old was acting as an assassin. Watch the clip in the player above.

Federal officials described Pretti as a threat in their early response to the shooting.

In DHS's first account of the incident, Assistant Secretary for Public Affairs Tricia McLaughlin said federal officers attempted to disarm the man.

An agent, fearing for his life and the lives of the other officers, "fired defensive shots," the statement said.

The man had two magazines and no ID, the statement said, suggesting "this looks like a situation where an individual wanted to do maximum damage and massacre law enforcement."

The agency attached a photo of the apparent weapon in its email to PBS News, in addition to posting it online.

DHS Secretary Kristi Noem described Pretti's actions as "domestic terrorism."

CBP commander Gregory Bovino said in a news conference Saturday that an agent involved in the shooting had eight years of experience. He repeated the DHS account of the shooting, including referring to Pretti as a "suspect."

"The victims are the Border Patrol agents," Bovino later told CNN.

Deputy White House chief of staff Stephen Miller, considered a key architect of Trump's mass deportation agenda, posted on social media that an "assassin" attempted to take the lives of federal agents, despite bystander video circulating online that did not support that version of events.

Separate analysis of the footage, conducted by The Wall Street Journal, The New York Times, The Washington Post, and CNN directly counter the administration's account of the shooting.

Pretti's parents lambasted the Trump administration's "sickening lies" about their son, noting that Pretti was not holding a gun when he was attacked by federal agents.

"He has his phone in his right hand and his empty left hand is raised above his head while trying to protect the woman ICE just pushed down all while being pepper sprayed," the statement added.

Gun rights groups released statements reiterating that it's legal to carry firearms during protests or while exercising their First Amendment rights. The National Rifle Association said in a social media post that "responsible public voices should be awaiting a full investigation, not making generalizations and demonizing law-abiding citizens."

Trump responded to the shooting in two posts on Truth Social. The president blamed Minnesota officials and local police forces for the shooting and for not protecting federal agents. In particular, he blamed the state's governor and mayor for "inciting insurrection" and deploying "pompous, dangerous, and arrogant rhetoric."

Trump then accused state officials of organizing a "cover up" to defraud the government. One of the president's posts had the same image of Pretti's gun that DHS shared on its social media accounts, saying it was "loaded … and ready to go."

Trump told The Wall Street Journal on Sunday that federal immigration agents would leave the Minneapolis area "at some point," though didn't provide a time frame. The Journal pressed the president on whether the agent who shot Pretti did the right thing. Trump didn't directly answer the question, eventually saying, "we're reviewing everything and will come out with a determination."

On Monday, Trump posted on social media that he's sending his border czar Tom Homan to Minnesota. White House press secretary Karoline Leavitt told reporters in a briefing the same day that Homan would lead operations on the ground in Minneapolis.

How Minnesotans are reacting to another deadly shooting

In court filings, witnesses described moments before and after the shooting. An unidentified physician said in a witness statement that none of the agents were helping Pretti after the shooting. The statement also said the agents wouldn't allow the physician to approach the body initially. Eventually, an agent patted the physician down and allowed the person to check for a pulse – the doctor did not feel one – before beginning to administer CPR. Another witness said they "didn't see [Pretti] reach for or hold a gun."

Minnesota's Department of Corrections created a new webpage aimed at combatting DHS misinformation, in particular countering false claims over its cooperation with ICE.

The Minnesota Bureau of Criminal Apprehension said that Homeland Security officials had "blocked" bureau agents from accessing the site of the shooting, as they did weeks earlier after Good's death.

Hundreds of protesters flocked to the site of Saturday's shooting, prompting city officials to urge calm as more details come to light about the deadly encounter.

"We recognize that there's a lot of anger and a lot of questions around what has happened, but we need people to remain peaceful," O'Hara said. "Please, do not destroy our own city."

Walz reiterated his call for Trump to remove federal agents from his state, saying they're "sowing chaos and violence."

"We've seen deadly violence from federal agents again and again and again," he said at a news conference Saturday.

The following day, Walz implored Americans to trust their own eyes.

"You know what you saw," the governor said, "and then you heard the most powerful people in the world, certainly in this country — the president, vice president, Greg Bovino, Kristi Noem — narrate to you what you were looking at that this was a domestic terrorist, crazed, running at law enforcement with the intent to kill massive numbers of them, sullying his name within minutes of this event happening."