Two of the four men who escaped Newark's Delaney Hall immigration detention center last week remain missing, the FBI says.

About 50 immigrants being held 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.

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.