With 1,500 troops reportedly on standby to deploy to Minnesota, tensions are rising in the state as protests continue against Donald Trump's immigration crackdown. US officials say they are targeting the 'worst of the worst' but critics warn migrants with no criminal record and US citizens are being detained, too.

It could be anybody, says Sunshine, as she drives around her neighbourhood, St Paul - one of the so-called Twin Cities, along with Minneapolis. Snow and ice swirl over the tarmac in the bitter wind.

Sunshine is not her real name - she has asked to use a pseudonym because of fears she could be targeted for her actions. I have decided for my own safety to give them more space, she says, referring to the unmarked patrol cars ahead, driven by the US Immigration and Customs Enforcement (ICE) agents she is trying to track.

Each day, residents in loosely organised groups drive around their neighbourhoods trying to spot ICE agents and film them, they say, to hold them to account. I, we, have the legal right to drive on the streets of our own city and we have the legal rights to observe [the ICE agents], but they seem to have forgotten that, Sunshine says.

This week as the temperature plummeted, protests intensified against ICE agents outside the federal building hosting them. Minnesota officials have urged protesters to stay orderly and peaceful, and local officials have said the majority have stayed trouble-free. But at times there have been clashes, with the authorities deploying tear gas and pepper balls to disperse crowds.

On Friday, a US federal judge issued an order limiting the crowd control tactics that can be used by ICE agents toward peaceful protesters in Minneapolis. Judge Katherine Menendez said federal agents cannot arrest or pepper spray peaceful demonstrators, including those monitoring or observing ICE agents.

Trump has vowed to press on with his mass deportation drive in Minnesota, with thousands of federal agents deployed to the state, many sent in the aftermath of the fatal shooting of Minneapolis woman, Renée Good, by an ICE agent on 7 January. The circumstances surrounding her death remain contested, with local officials arguing the woman was attempting to leave and posed no danger.

In her car, Sunshine spots two unmarked vehicles with darkened windows containing ICE agents. They follow them to a nearby neighborhood, where the two cars proceed to drive slowly and repeatedly around the block in circles, in what is seemingly a diversion tactic to take Sunshine away from a shopping centre immigrants often use.

This is the game. But if they're doing this with me, they're not putting their hands on someone, she says. Meanwhile, local reports indicate the community remains determined to challenge the actions of ICE, highlighting a deepened crisis in Minneapolis as protests and aggressive federal operations continue to escalate.