New York City’s mayor, Zohran Mamdani, and other local officials on Monday condemned Immigration and Customs Enforcement (ICE) after federal officers dragged a man out of a hospital building where he had been taken following an arrest, prompting a crowd of protesters to gather outside, where they clashed with police.

The incident over the weekend has also drawn scrutiny from critics questioning the New York police department’s response at the scene, in relation to New York City’s sanctuary laws, which bar local police from assisting federal immigration authorities in civil immigration enforcement.

The incident unfolded on Saturday night outside the Wyckoff Heights medical center in the Bushwick neighborhood of Brooklyn, where dozens began gathering after reports that ICE officers had brought in a man they had detained.

The Department of Homeland Security (DHS), the parent agency of ICE, said in a statement on Sunday that agents had been conducting “a targeted enforcement operation” in Brooklyn that “resulted in the arrest of Chidozie Wilson Okeke”, a Nigerian citizen. The agency said he had overstayed a tourist visa and also had been previously arrested for assault and drug possession, though it did not provide further details.

The DHS said that during the arrest Okeke had refused to comply with officers’ orders, and that a physical tussle occurred, during which agents used force to make the arrest. The DHS added that Okeke then requested medical attention, prompting agents to bring him to the hospital for evaluation.

The DHS said that a “significant” crowd then formed outside the hospital.

The NYPD has said that officers responded to reports of “multiple disorderly groups” near the hospital.

“Upon arrival, officers observed numerous individuals acting in a disorderly manner, obstructing vehicular traffic, and blocking emergency entrances and exits at Wyckoff Heights medical center,” the police said.

In the early hours of Sunday, video clips circulating online show ICE dragging the detained man out of the hospital in handcuffs and putting him into a waiting car, while protesters clashed with police.

The NYPD said it was not involved in the federal immigration operation and only responded to the scene after receiving 911 calls about the crowd, saying they received initial reports that there were about 200 protesters.

Police issued verbal warnings for individuals to disperse and return to the sidewalks and eight people were arrested and charged with resisting arrest, obstructing governmental administration and reckless endangerment, the NYPD said.

Sandy Nurse, a New York city council member who was present, wrote on social media that she went to “observe our community responding to news that ICE was there”, adding: “New Yorkers showed up immediately.”

On Monday, she said it was unclear whether the way NYPD acted, particularly in putting themselves between protesters and the ambulance bay where ICE brought the man out, violated the city’s sanctuary laws, but it was vital to know so that local elected officials can communicate the best way for their constituents to be safe.

“If it’s not [a violation], then there should be a clear ability to say in moments like that, that the NYPD will facilitate a secure exit of ICE with a detainee. If it does [violate], then there needs to be accountability,” she said, in a phone interview. “It’s not my job, it’s the [Mamdani] administration’s job and it’s the police commissioner’s job to provide clarity to New Yorkers on what can be expected – and … we can make a determination: does the sanctuary city law need to be even more detailed?”

The NYPD said in a statement that it does not conduct or participate in civil immigration enforcement, and had “no prior awareness or coordination” regarding the ICE operation that took place on Saturday night.

Mamdani’s office did not immediately respond to a request for further comment. At a news conference on Monday morning, the mayor said: “I want to be very clear, there was no prior coordination nor planning between the NYPD and ICE ahead of this incident, NYPD officers were not dispatched to the hospital to participate or facilitate an ICE operation, rather they were responding to 911 calls regarding a protest outside of the hospital.”

He added: “Our laws leave nothing, no room for interpretation, about the fact that our NYPD will not participate in civil immigration enforcement, and I’ve also been very clear about my views on ICE raids as a whole. I think that they are cruel, I think that they are inhumane and I think that they do not serve any interests of public safety.”

Mamdani said that he had seen some videos from the incident, including one that he said showed an NYPD officer “grabbing a New Yorker and throwing them on to the floor”.

“That is incredibly disturbing and that is being actively investigated right now,” Mamdani said.

An immigration activist who attended the protest and did not want to be named because she fears repercussions from law enforcement said that she hoped that Mamdani would rise to the occasion. “We need the mayor to stand on the side of our communities and our neighbors, and what that looks like is telling the NYPD to back off,” she said.

In a social media post on Saturday, the Brooklyn borough president, Antonio Reynoso, said: “ICE’s presence in Bushwick is deeply alarming …

“To our neighbors who quickly mobilized last night, thank you for making it loud and clear that ICE is not welcome in Brooklyn.”

The New York state senator Julia Salazar, whose district includes Bushwick, also said on social media that ICE appeared “to have significantly increased its presence in Bushwick recently”.

“It’s also concerning that this many NYPD officers were deployed for what was clearly a justified gathering by local residents,” she added.

Murad Awawdeh, president of the New York Immigration Coalition, said the events reinforce the need for stronger sanctuary protections that clearly define what collusion looks like.

“This is where it falls in a gray area,” Awawdeh said. “You have a local law that says NYPD cannot collude on civil immigration enforcement and the action that ICE did was civil immigration enforcement. Then you have the NYPD being called … to support in clearing the street. How do you define non-collusion in a moment like that?”

Awawdeh also called for an investigation into the NYPD’s actions and for police to drop charges against the arrested protesters.

Donald Trump retook the White House with an agenda of mass deportation, and his Republican administration favors targeting sanctuary cities, especially larger, Democratic-run cities, although New York has so far avoided the large-scale ICE and border patrol sweeps that brought violence and chaos to parts of Los Angeles, Chicago and Minneapolis.

Norwegian fish farms are filling fjords and other coastal waters with nutrient pollution equivalent to the raw sewage of tens of millions of people each year, a report has found.

Norway is the largest farmed salmon producer in the world, and nutrients in fish feed are excreted directly into coastal waters. Analysis from the Sunstone Institute found that Norwegian aquaculture released 75,000 tonnes of nitrogen, 13,000 tonnes of phosphorus and 360,000 tonnes of organic carbon in 2025.

The nutrients are equivalent to those contained in the untreated sewage of 17.2 million people for nitrogen, 20 million people for phosphorus, and 30 million people for organic carbon, the report found, raising fears of destructive algal blooms.

“Norway is a small country of just 5.5 million people, and the output of aquaculture pollution in terms of these three nutrients is three to five times larger than the population,” said Alexandra Pires Duro, a data scientist at Sunstone and author of the report. “The faeces, the uneaten feed, the urine – everything goes into the water.”

Fish in farms are fed pellets of nutrient-rich feed in open-net cages as they are grown for human consumption. The analysts calculated the mass of nutrient inputs that remained in the water using data from the national fisheries directorate and veterinary institute.

Researchers found feed consumption had increased by 14.6% over a six-year period, in line with industry expansion, producing nutrient pollution in 2025 that equated to levels expected in the raw sewage of a country about the size of Australia. In a separate analysis, the report authors found that seasonal variation aggravated the problem, with nutrient load highest in summer months when ecosystems are least able to absorb it.

Fish sludge from nutrients can fertilise phytoplankton and lead to destructive algal blooms that deplete oxygen levels. Fjords are particularly vulnerable to such effects because they are semi-enclosed bodies of water, allowing for greater accumulation of nutrients. Their oxygen levels are already declining because of global heating.

In Sognefjord, the country’s longest fjord, increased nutrient inflows – not just from fish farms – were held responsible for about two-thirds of the oxygen depletion, a study found last year, while warmer water was blamed for the other third.

Oxygen levels in deep waters have also declined in the second-longest fjord in Norway, the Hardangerfjord, according to the country governor for Vestland.

In March, officials rejected nine applications for fish farms in the fjord on account of the increased emissions they would cause. Tom Pedersen, an environmental adviser for the region who served as an expert reviewer on the Sunstone report, said the figures in its analysis were unsurprising and even “on the conservative side”.

“The major concern we experienced in the last few years is that all these algae and plankton and whatever die and they sink down to the bottom of the floor and they decompose – and that process uses oxygen,” he said. “The end result is that the oxygen level in the fjord is going down, and has gone down.”

The Norwegian fisheries ministry referred a request for comment to the fisheries directorate, which declined to comment.

Krister Hoaas, head of public affairs at the Norwegian Seafood Federation, the main industry association, said the volume of emissions reflected how much food is produced in Norway, and the degree of self-sufficiency the country would have in an emergency. He said the industry was working continuously to make its environmental footprint as small as possible.

“It is important to distinguish between current operations and questions about future growth,” he added. “The Institute of Marine Research is clear that a significant increase in production in certain fjord systems could increase the risk of eutrophication locally, but that current production is well within nature’s carrying capacity. This provides a basis for strict, site-specific management, but does not document that current operations are destroying the fjords.”

Keir Starmer will call for a whole-of-society response to rising antisemitism on Tuesday, saying that it is not enough simply to condemn the scourge, but people “must show it” through their actions too.

Before a roundtable event at Downing Street, the prime minister will call for action on all forms of antisemitism, after a knife attack against the Jewish community in Golders Green last week, a spate of serious arson attacks and the terror incident in Heaton Park in October.

Sarah Sackman, the Labour MP for Finchley and Golders Green, said there had been a “lack of vocal solidarity” from parts of the liberal left, including some anti-racist organisations, in the face of rising antisemitism across the UK.

No 10 will host representatives from across society including business, charities, health and culture, higher education and policing, for talks with the Jewish community. Starmer is expected to say they all need to refuse to platform hatred or turn a blind eye to extremism.

“Last week’s terrorist attack in Golders Green was utterly appalling. But it was not an isolated incident. It is part of a pattern of rising antisemitism that has left our Jewish communities feeling frightened, angry, and asking whether this country, their home, is safe for them,” he will say.

“These disgusting attacks are being made against British Jews. But, make no mistake, this crisis – it is a crisis for all of us. It is a test of our values. Values that are not guaranteed, but are earned. Every single day, through our actions.

“So, it is not enough to simply say we stand with Jewish communities. We must show it. And that responsibility lies with each and every one of us.”

Starmer will also convene minsters for the latest Middle East response committee, this time focused on the domestic security implications of the conflict, in particular the heightened threat to Jewish communities.

The government has announced an additional £25m in funding to increase police patrols, enhance security at synagogues, schools and community centres, and place specialist and plainclothes officers in communities.

The Golders Green stabbings have intensified calls for action, coming within weeks of other antisemitic incidents in the same area. The police are investigating whether these incidents involved criminal proxies acting for Iran.

Sackman, who is also the courts and legal services minister, said there has been an outpouring of support since last week’s knife attack in her constituency, with messages from Christian and Muslim faith leaders. The incident had “clearly resonated” with people, she added.

“For a minority community to come under this sort of sustained level of threat and attack purely for our identity, you would expect in the normal run of things for anti-racist organisations, for trade unions, for cultural leaders to speak out,” she told the Times.

“I think what has been notable is, for some time now, a lack of vocal solidarity from the moderate majority. You would expect our anti-racist movement, who quite rightly come out vocally, regularly for other minoritised communities to have responded in kind.”

Last week she wrote for the Guardian saying Jewish people wanted to go about their daily lives – working, taking their children to school and practising their faith – free from fear. Sackman wrote that she now finds herself gripping her daughters’ hands more tightly, adding that many British Jews feel exhausted and afraid.

“Where are the marches in solidarity and support of our Jewish community? Where is the response of the liberal left? Where are the anti-racists, the trade unions, civil society, our friends and neighbours?” she wrote.

“Where are the leaders of the powerful tech platforms who have allowed hate to proliferate via their algorithms? Where are the university chancellors, the leaders of our cultural sector and the NHS managers who must urgently root out hate in their institutions?”