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.

Benjamin Hanil Song is accused of shooting an Alvarado police officer during an attack on the Prairieland Detention Center.

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.”