In the past week, DPS troopers have arrested dozens of SIAs, Texas DPS Lt. Chris Olivarez said in a series of social media posts.

SIAs are noncitizens who, based “on an analysis of travel patterns,” are “known or evaluated to possibly have a nexus to terrorism” who “potentially poses a national security risk to the United States,” the U.S. Department of Homeland Security explains. Having an SIA designation does not necessarily mean the individual is a terrorist, but their travel pattern “indicates a possible nexus to nefarious activity (including terrorism) and, at a minimum, provides indicators that necessitate heightened screening and further investigation,” DHS says.

On Oct. 11, DPS troopers apprehended 165 foreign nationals in Quemado, outside of Eagle Pass, after they illegally entered Texas from Mexico. Among them were 14 identified as SIAs – citizens of Iran, Egypt, and the Democratic Republic of the Congo.