 However, the recent killings of a Maryland mother of five and a 12-year-old girl from Houston, in which illegal migrants are the suspects, the arrests of eight Tajikistani nationals with ties to ISIS, and a new report that DHS has identified over 400 people brought to the U.S. by an ISIS-affiliated smuggling network all raise concerns. Mayorkas says... If an individual is of concern from a national security or a public safety perspective, they are a priority for detention.