Police arrested at least 20 protesters outside embattled New Jersey ICE detention center Delaney Hall Sunday night after they broke a new curfew imposed to stop the violent rallies from continuing for a third week straight, as the Department of Homeland Security vowed to show “ZERO tolerance for rioters.”

Local and state police closed off a length of Doremus Avenue, roughly a quarter-mile around Newark’s Delaney Hall, to stop crowds of protesters from reaching the immigrant detention facility and launched an all-out offensive against any unruliness, The Post observed.

After cops announced the 9 p.m. curfew to encourage people to leave, the number of protesters dwindled to roughly 100. Police in riot gear then advanced into the crowd of naysayers while shouting, “Move in!”

Cops fired two rounds of tear gas toward protesters who yelled, “Give peace a chance” and “No Trump, no KKK, no fascist USA” — sending more people fleeing until roughly 50 protesters and members of the press were corralled into a tight circle.

As those with press passes filed out of the group, officers swooped in and cuffed roughly 20 to 25 remaining protesters. Police didn’t immediately confirm the exact number of arrests.

Several arrests were made in front of a wall disturbingly grafittied with “KILL ICE” across it.

Footage posted by DHS captured the protesters flanked by officers in riot vests and helmets being hauled into Essex County Sheriff’s Department buses.

Another clip captured a man sitting and being dragged from behind by multiple officers who were standing in a barricade line, which the department captioned: “Don’t be this guy.”

“If you riot, you will face the consequences. Law and order prevails,” DHS posted on X. “ZERO tolerance for rioters.”

DHS, the Newark Police Department, and the Essex County Sheriff’s Department did not immediately respond to The Post’s inquiries about the arrests.

Newark Mayor Ras Baraka instituted a 9 p.m.-to-6 a.m. curfew around Delaney Hall until further notice following a series of intense, violent clashes between anti-ICE protesters and agents earlier this week.

Individuals who violate the curfew will receive an initial warning, but will be removed and face possible legal action if they refuse to comply, Baraka said in a statement.

Chaos has engulfed the immigration detention facility in Newark since at least May 22, after top Democratic officials, including New Jersey Gov. Mikie Sherrill, raised concerns about inhumane conditions in the facility and the lack of visitation hours.

Inmates inside reportedly launched a hunger strike over the conditions.

The Trump administration has countered that the standard of living at Delaney Hall is higher than most US prisons.