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.

Alvarado police offers were dispatched to the detention center in the 1200 block of Sunflower Lane around 10:56 p.m. Friday, according to the Johnson County sheriff’s office. The call was made to investigate a report of “a suspicious person.”

An Alvarado police officer was shot in the neck responding to a call near Prairieland Detention Center but was treated and released from the hospital, officials say.