DALLAS (CBSDFW/AP) – Eleven detainees at a South Texas family detention center have tested positive for the novel coronavirus, Immigration and Customs Enforcement reported Thursday.

The outbreak was reported at the center near Karnes City, about 50 miles southeast of San Antonio.

READ MORE: Mesquite Police Identify Officer Killed In Shooting

Starting Monday, all of the center’s detainees were tested for COVID-19, the illness the coronavirus causes, according to court monitor Andrea Ordin. ICE officials reported the test results Thursday, and all 11 detainees who tested positive showed no symptoms but were placed under medical isolation and are being monitored for any symptoms.

READ MORE: Mesquite Officer Dies After Shooting Outside Grocery Store

It was unclear how many were tested, but the center has a capacity of 830 residents. The 11 found to be affected comprise parents and children, said Yari Aquino, spokeswoman for the immigrant advocacy group RAICES. Those isolated have only limited access to their families and attorneys, she said.

MORE NEWS: Officials React To Mesquite Officer Killed On Duty

Latest Coronavirus News | Coronavirus Resources