Hundreds of dangerous illegal migrants have been transferred out of a New Jersey detention center, reducing the facility’s occupancy to only about 20%. This comes after last week’s disturbance that allowed four violent detainees to escape during an uprising.

The Delaney Hall Detention Center in Newark, which can accommodate 1,000 inmates and is the largest on the East Coast, now houses approximately 200 migrants, according to Homeland Security officials.

This facility has been a point of controversy. Last month, Newark Mayor and gubernatorial candidate Ras Baraka was arrested during a protest at the center. Last week’s escape added to its notoriety.

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Authorities haven’t confirmed the exact number, but sources state that all those transferred out are hardened criminals, including individuals with charges of murder and sexual assault.

People have been moved to other detention centers in Texas and Pennsylvania. Reports suggest the prison break may be linked to security lapses by the private contractor managing the facility, GEO Group, which only reopened the center in May.

Insiders call for improved staff and security measures before the facility can resume full operations. Meanwhile, lower-level detainees are now being housed there as investigations continue.

GEO Group was awarded a 15-year, $1 billion contract to operate the detention center in February. Critics say the facility housed a large number of violent offenders, citing Newark’s reputation as a sanctuary city with high crime rates.

Among the escapees, some were detained for assault and burglary; one is still at large. Last week’s “uprising” involved a breach through drywall connected to an outside wall and into the parking lot, according to Senate officials.

However, DHS officials denied reports of widespread unrest, stating there was no major disturbance during the escape.