Federal authorities say a group of people carried out an ambush attack on law enforcement at an immigration detention facility in North Texas. Over the weekend a police officer was shot in the neck outside the prairieland detention center in Alvarado.

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.”