A federal law enforcement source told CBS News that local police arrested eight people. The official said some of those apprehended were wearing body armor.

Since then, acting U.S. Attorney for the Northern District of Texas Susan Larson provided more details about an attack that occurred around 11 pm on July 4 at the ICE Prairieland Detention Center in Alvarado, Texas. The facility, which opened in 2017, is owned by the City of Alvarado, operated by LaSelle Corrections and has a 707-bed capacity.

Prairieland’s proximity to the Dallas area makes it more accessible for lawyers representing clients detained there, the Chavez & Valko site states. The other three facilities in the operations area of ICE’s Dallas field office are in Anson, Eden and Haskill, at least a 3-hour drive west of the Metroplex.