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 men who escaped from the Delaney Hall detention center were being held on serious charges ranging from aggravated assault and burglary to making terroristic threats.

About 50 inmates at Delaney Hall, the ICE detention facility in Newark, banded together and pushed down the wall of a dormitory room when meals were hours late, a lawyer told NJ Advance Media.