Four detainees have escaped from a federal immigration detention center in New Jersey, which has been the center of protests since its opening in May and where both a sitting congresswoman and Newark’s mayor have been arrested.

Four detainees escaped when tensions boiled over at the ICE facility​ known as Delaney Hall in Newark, the Department of Homeland Security said.

The search for four detainees who went missing from an immigration detention center in New Jersey a day ago continues Friday, with federal authorities confirming the group escaped the facility. The detainees were being held at the Delaney Hall facility in Newark,