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.

On June 12, detainees at Delaney Hall in Newark pushed down a wall and escaped during a disturbance that prompted a major law enforcement response.

While protests Wednesday were relatively peaceful, some turned into scenes of chaos as police fired with less lethal munitions to the disperse crowds.