Denver city leaders said Friday they were unaware federal officials are planning raids on undocumented immigrants this weekend before they read media accounts about the operation.

“Denver is aware of recent reports that immigration enforcement would increase in the coming days, but Denver Police and the City of Denver would never receive advance notice of ICE activity,” Mayor Michael Hancock’s office said in a statement.

Multiple news outlets reported mid-day Friday that 10 cities, including Denver, will be targeted by U.S. Immigration and Customs Enforcement for enhanced enforcement Sunday. In a city that has pushed back against President Donald Trump, officials say notice wasn’t given or expected.

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“The Denver Police Department is not aware of any ICE operations,” the department said in a statement. “The Denver Police Department does not assist ICE with any enforcement action. If they ask for help due to an emergency, we will respond just like we do when anyone else asks for help.”

ICE said it cannot give specific details about its coming operations “due to law enforcement sensitivities” and safety concerns. The agency said it prioritizes the arrest of undocumented immigrants “who pose a threat to national security, public safety and border security.”

“All of those in violation of the immigration laws may be subject to immigration arrest, detention and — if found removable by final order — removal from the United States,” an ICE spokesman said.

The Washington Post reported Friday that a roundup of as many as 2,000 families facing deportation orders is expected to begin with predawn raids Sunday, in Denver and elsewhere. Trump and ICE director Mark Morgan advocated for the operation, known as a “family op.”

Rumors of Sunday’s supposed raids sent Colorado congressional offices scrambling for information. Rep. Diana DeGette, a Denver Democrat, said ICE confirmed it will be conducting “operations” against immigrants but refused to provide further details to her.

“What this administration is doing to these immigrant families is shameful,” DeGette said in a statement. “Instilling fear in the hearts of families across the country by announcing these nationwide raids, while continuing to lock up kids at the border, is not who we are as a country.”

Gov. Jared Polis’ office said it also reached out to the federal government for more information but hasn’t “been able to get a clear answer about this operation and whether it involves actions in Colorado.” The governor’s office said it will continue monitoring the situation.

Trump had indicated enforcement against undocumented immigrants would increase, saying so on Twitter on Monday and at the White House on Tuesday. Colorado immigrant rights groups have been informing members of their legal rights this week in case ICE agents come knocking.

“No one should be detained and deported,” the Colorado Rapid Response Network said on Facebook Friday afternoon. “It’s critical that we all do what we can to protect our community members to ensure they live in the safety and peace that we all deserve.”

Police in the diverse city of Aurora began reaching out to immigrant communities there to answer questions and address concerns the city’s refugees and other immigrants may have.

Aurora Police Chief Nick Metz published a blog post stating his department cannot detain people based on immigration status, does not ask people for their immigration status and does not share immigration statuses with other government agencies. Those policies will not change, he said.

“It is our goal to ensure that all individuals within Aurora feel safe when it comes to reporting emergencies and criminal activity,” Metz wrote. “Our desire has always been that our residents should not be fearful of the women and men who protect and serve our diverse community.”

Raids by ICE in the Denver area likely would worsen strife between state and local officials and the Trump administration, sides that rarely see eye-to-eye on the issue of immigration.

While disagreeing with conservative claims that they created sanctuaries for undocumented immigrants, Hancock and Polis have also made clear their disagreements with Trump’s hardline approach to immigration, a topic often on the president’s mind and lips.

In April, Trump suggested he might release detained immigrants in what he considers to be sanctuary cities, such as Denver. Hancock then accused Trump of using immigrants as political pawns and spreading fiction.

“We want to reiterate that Denver stands with our immigrant and refugee families,” the mayor’s office said Friday, “that we do not support family separation or the roundup of immigrant families to spread fear in our community.”

Last month, Polis signed legislation prohibiting Colorado police from complying with ICE requests to hold immigrants beyond their release dates. The next day, ICE called it a “dangerous policy” and implied it will lead to violence against “innocent citizens, lawful residents and visitors.”