<h1>Rooftop gunman targets immigration detention center, kills one detainee, wounds two; FBI calls it targeted violence</h1> A person opened fire from a rooftop at an immigration enforcement facility, killing one detainee and critically wounding two others; no agency staff were hurt. Investigators say the attacker conducted extensive pre-attack planning, left handwritten notes expressing intent to terrorize agents, searched online for ballistics and tracking apps, and downloaded a list of homeland security sites; electronic devices and evidence were seized from a nearby residence. The FBI is treating the incident as targeted violence; a bolt-action rifle and a bullet marked with an anti-agency message were recovered. Federal authorities ordered heightened security at similar facilities while the investigation continues.