The fatal shootings of Renee Good and Alex Pretti by immigration agents and a sweeping federal operation have transformed the city.

Volunteers in Minneapolis often respond to confrontations with immigration agents, helping those exposed to a chemical irritants.Stephen Maturen / Getty Images file

These days it`s hard to do anything here without coming across the city`s grief over the killing of two Americans by immigration agents, residents say.

Anti-ICE signs are plastered on streetlights and hang over walking bridges. "Know your rights" flyers sit next to the cream and sugar at local coffee shops.

"When I go to the grocery store now, it`s like, this all feels so weird to be doing normal things when we feel like we`re under attack," Ann Cary said as she handed out doughnuts Sunday to people around the site of Alex Pretti`s killing.

In the weeks since 3,000 federal agents flooded the streets here, many say, nothing about daily life feels the same.

Residents say reminders of the city`s grief over the killings of Alex Pretti and Renee Good by immigration agents are everywhere.Alex Kormann / The Minnesota Star Tribune via Getty Images

Volunteering has exploded. Many here now respond to Immigration and Customs Enforcement sightings within their neighborhoods to record or prevent apprehensions. Others form human chains surrounding the city`s schools, carrying walkie-talkies and whistles. Some spend their nights delivering groceries to undocumented families who are afraid to leave their homes.

Steven Young, 41, quit his job as a corporate attorney last month, a day after, he said, he and other volunteers surrounded an apartment building and blocked federal agents from leaving with detained tenants.

"Trying to go back to a phony-baloney corporate job of filing trademarks and talking about profit shares versus incentives and other just horse s-- is just so ultimately meaningless," Young said. "I`ll figure something else out. But right now, my city needs me.`"

Now he spends his days monitoring Signal group chats for ICE sightings in his neighborhood in central Minneapolis. If he`s alerted to one in real time, he`ll drive there with the goal of deterring or recording apprehensions.

Since December, the surge of federal immigration personnel to Minnesota led to the apprehensions of more than 3,000 migrants in what the Department of Homeland Security has called "the largest immigration enforcement operation ever." During that time, federal immigration officers shot and killed two U.S. citizens, Renee Good and Alex Pretti.

Anti-ICE signs are visible throughout the city, plastered on businesses and hanging from overpasses.Kerem Yucel / AFP via Getty Images file

The fallout from the deaths and the unprecedented immigration crackdown now permeates daily life throughout the city.

At the usually bustling Midtown Global Market, food stalls sat empty Monday - and only a handful of people ate lunch. Ben Johnson, who manages the market, said business is down roughly 50% since federal agents began detaining people in the surrounding neighborhoods. He has hired extra security for the building, but he said many stall owners and their employees are too scared to work, fearing deportation.

Pastor Sergio Amezcua of Dios Habla Hoy church has organized more than 4,700 volunteers to deliver groceries and pack boxes filled with essentials. Volunteers are delivering to nearly 28,000 families who have registered for assistance through his mutual aid operation, Amezcua said.

"It`s a humanitarian crisis," he said Monday.

During the rescheduled Timberwolves basketball game Sunday, the Target Center was filled with fans carrying "ICE out now" signs. A moment of silence was held for Pretti before tipoff.

For some in the Somali community, Operation Metro Surge has made the fear of being stopped by immigration agents a daily concern, even for those who are U.S. citizens.

Abdi Hassan, 19, a Somali American who has lived in the U.S. since he was 2 years old, said friends have been racially profiled in recent weeks. He said that he takes his ID everywhere and that his parents worry when he leaves the house.

"I might just be snatched up for no reason. ... It`s been scary lately," he said. "It`s terrifying."

On the day Renee Good was fatally shot, Border Patrol agents detained people at nearby Roosevelt High School.Kerem Yucel / AFP - Getty Images file

Disruptions at schools and on the streets

ICE detained a parent at a school bus stop this month in Robbinsdale, a Minneapolis suburb, Robbinsdale Area Schools Superintendent Teri Staloch said in a statement. On the day Good was killed, U.S. Border Patrol agents clashed with teachers and protesters at nearby Roosevelt High School, leading to the arrest of at least one educator, according to the teachers . And at least four children were apprehended by ICE in recent weeks, two of them while they were on their way to school, according to the district.

It is unclear whether the children have been released, as Staloch declined to share their names. DHS has said that it does not target children and that "ICE is not going to schools to make arrests of children."

Some families have stopped sending their kids to school as a result.

The Minneapolis Public School District and Saint Paul Public Schools, which collectively serve more than 60,000 students, started offering students online classes as alternatives to in-person learning.

Leah Hood teaches Spanish-speaking adults English at a public school in a Minneapolis suburb, which she asked NBC News not to name because of her students` safety concerns.

Leah Hood has been volunteering to patrol streets in Minneapolis this week. Courtesy Leah Hood

Before the crackdown, her classes had attendances of roughly 30 to 35 students. But in recent weeks, just a handful of students have shown up for class, she said.

When ICE vehicles were visible from school property last week, classes got canceled, she said. On Monday, classes were moved fully online.

"‘Disgusted` doesn`t even come close to covering it, but I am absolutely sickened, appalled, horrified," Hood said. "This administration is evil."

Protests have become routine in the city and are mostly peaceful.

And wherever there are protests, there are more volunteers. Throughout the rallies are people passing out hand warmers, water bottles and hot coffee.

Demonstrations take place daily outside the Bishop Henry Whipple Federal Building, which hosts an ICE detention center. Hundreds of protesters formed a picket line at Minneapolis-St. Paul International Airport on Friday so long that it spanned the length of the terminal for departing flights. Tens of thousands more braved subzero temperatures to march the streets of the downtown neighborhood during a partial economic blackout Friday.

Savannah Thissen protested on the streets where Pretti was killed Saturday evening, hours after the shooting. She said protesting or delivering groceries has become routine for her when she`s not working as a health care coordinator.

"If we don`t risk our safety now and here, they will just keep killing us," Thissen said.

"My hobbies can wait."

Minneapolis residents say the outrage and grief over the federal presence in their city have pushed them to respond.Jeff Wheeler / The Minnesota Star Tribune via Getty Images file

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By Matt Lavietes and Alicia Victoria Lozano/nbc