Anchorage police were called to the office by the agency, told Santiago he was having "terroristic thoughts" and believed he was being influenced by the so-called Islamic State group and was taken to a mental health facility, city Police Chief Chris Tolley said. Santiago had left a gun and his newborn child in his vehicle when he went to the FBI office. Police held the gun until Santiago was released and contacted him about picking up the weapon, which he did on Dec. 8, Tolley said.